# Simmering

Simmering is cooking food in liquid held just below boiling — 85-96°C (185-205°F) — where small bubbles rise gently without a full rolling boil, used for stocks, stews, sauces, and delicate proteins.

**Simmering** is cooking food in liquid held just below the boiling point, around 85-96°C (185-205°F), where small bubbles rise gently and break the surface without the violent churn of a full boil. It's the gentle middle ground between [poaching](https://fond.kitchen/glossary/poaching/) and [boiling](https://fond.kitchen/glossary/boiling/), and it's how almost every stew, stock, sauce, and braise actually cooks.

The visual cue is the giveaway. At a simmer you see a steady stream of small bubbles rising lazily, with an occasional larger bubble breaking the surface. It's active, but calm. A rolling boil churns the whole surface; a simmer barely ripples it.

## What does simmering mean?

To simmer means to cook something in liquid kept just below the boiling point, so the liquid moves gently instead of churning. Recipes use the word three ways:

- **"Bring to a simmer"**: heat the liquid until small bubbles rise steadily, then hold it there. It's a target, not a boil you back off from.
- **"Bring to a boil, then simmer"**: get the liquid hot fast, then lower the heat until the bubbling calms. This is the most common instruction for stews, beans, and sauces.
- **"Simmer for 20 minutes"**: keep the liquid at that gentle bubble for the stated time, adjusting the heat as the pot warms up or the liquid reduces.

The word comes from an older English verb for a low, steady hum, which is a fair description of what a simmering pot sounds like. Trust the bubbles over the dial: every stove's "low" is different, so "simmer on medium-low" means nothing until you look in the pot.

**Simmering at a Glance**
- Temperature | 85-96°C (185-205°F)
- Visual cue | Small bubbles rising steadily, gentle surface ripple
- Heat setting | Usually medium-low, but watch the pot
- Best for | Stocks, stews, sauces, beans, delicate proteins
- Why it works | Gentle heat keeps proteins tender and stocks clear
- Lid | Partially on for slow cooking, off to reduce

## What temperature is a simmer?

A simmer is roughly 85-96°C (185-205°F), which is below water's boiling point of 100°C (212°F) at sea level. There's a range because "simmer" covers a few intensities, from a barely-moving low simmer to a brisk simmer just shy of a boil.

You don't need a thermometer once you can read the bubbles. A low simmer (around 85-90°C) shows tiny bubbles rising occasionally. A standard simmer (90-96°C) has a steady stream of small bubbles. Push past that and you're at a rolling [boil](https://fond.kitchen/glossary/boiling/).

Most recipes that say "simmer" want that gentle, steady-bubble stage. It cooks food through without the rough agitation that toughens proteins or clouds a [stock](https://fond.kitchen/glossary/stock-vs-broth/).

### Bare simmer, gentle simmer, brisk simmer, boil

Cooks use a handful of terms for the steps between "hot" and "boiling". They describe what the surface looks like, not an exact temperature, but they map roughly like this:

| Term | Approx. temperature | What you see | Typical use |
|------|--------------------|--------------|-------------|
| Bare simmer | 82-88°C (180-190°F) | A bubble every second or two, surface barely moves | Poaching, stocks, custards, milk |
| Gentle simmer | 88-93°C (190-200°F) | Small bubbles rising steadily, light ripple | Stews, braises, beans, sauces |
| Brisk simmer | 93-99°C (200-210°F) | Constant small bubbles, surface clearly moving | Reducing sauces, cooking grains |
| Brisk or rolling boil | 100°C (212°F) | Large bubbles churning the whole surface | Pasta, blanching, sterilizing |

"Brisk" is the word that confuses people. A brisk simmer is still below the boil; a brisk boil is a full boil. If the surface is heaving rather than rippling, you're boiling.

## What is the difference between simmering and boiling?

The difference is temperature and bubble intensity. Simmering holds at 85-96°C with small, gentle bubbles; [boiling](https://fond.kitchen/glossary/boiling/) is a full 100°C with rapid, rolling bubbles that churn the whole surface.

- Temperature | 85-96°C (185-205°F) | 100°C (212°F)
- Bubbles | Small, gentle, steady | Large, rapid, rolling
- Agitation | Low, keeps food intact | High, can break food up
- Best for | Stews, stocks, sauces, beans | Pasta, blanching, hard eggs
- Result | Tender, clear, even | Fast, vigorous

This is why so many recipes say "bring to a boil, then reduce to a simmer." You boil to get the liquid hot fast, then drop to a simmer so the food cooks gently. A stock simmered stays clear; a stock boiled turns cloudy because the rapid bubbling emulsifies fat and breaks up proteins. For tough cuts, a long, low simmer is what melts collagen into gelatin without squeezing the meat dry.

## Why do you simmer instead of boil?

Simmering is gentler, and that gentleness protects food in three ways. It keeps proteins tender, since a hard boil seizes and toughens meat, fish, and eggs.

It keeps liquids clear. A [stock](https://fond.kitchen/glossary/stock-vs-broth/) or consommé simmered slowly stays clean and bright, while boiling churns fat and protein into a cloudy mess.

And it lets flavors develop slowly. A [braise](https://fond.kitchen/glossary/braising/) or stew held at a simmer for hours melts connective tissue into silky gelatin and lets flavors meld, something a fast boil can't do without overcooking the outside. When you want that same breakdown in a fraction of the time, [pressure cooking](https://fond.kitchen/glossary/pressure-cooking/) raises the temperature above the boiling point to get there faster.

> **Note:** Boiling a delicate sauce or a milk-based dish often causes it to break or scorch. A gentle simmer keeps emulsions stable and prevents the bottom from catching.

## Should you simmer with the lid on or off?

It depends on what you want. Keep the lid on (or partially on) to trap heat and cook slowly without much evaporation, which is right for long braises and stews. Take the lid off when you want the liquid to [reduce](https://fond.kitchen/glossary/reduction/) and concentrate, as with a pan sauce or a reducing stock.

A partially covered pot is a useful middle setting. It holds heat well while letting some steam escape, which keeps the simmer steady and lets the liquid slowly thicken. If your simmer keeps creeping up to a boil with the lid on, crack it open or lower the heat.

## How do you maintain a steady simmer?

The trick is matching the heat to the pot, then adjusting by eye rather than by the dial number.

1. Bring the liquid up to a boil first, so it heats quickly
2. Reduce the heat to medium-low once it boils
3. Watch for small bubbles rising steadily without a rolling churn
4. Adjust the heat up or down until the bubbling stays gentle
5. Cover partially if it keeps trying to boil over
6. Check periodically, since reducing liquid can change the simmer over time

Heavy pots hold a simmer more steadily than thin ones because they retain heat. If your simmer keeps stalling or surging, a heavier pan and a diffuser (or moving the pot slightly off-center on the burner) helps keep it even.

## What are common simmering mistakes?

**Simmering Problems**
**Stock turned cloudy**
You let it boil instead of simmer. Rapid bubbling emulsifies fat and breaks up proteins, clouding the liquid. Keep stocks at a bare, gentle simmer and never let them reach a rolling boil.
**Meat came out tough and dry**
The simmer was too aggressive, closer to a boil. High heat seizes proteins. Drop to a low, gentle simmer and give tough cuts time to break down.
**Sauce scorched on the bottom**
The heat was too high or the sauce wasn't stirred. Lower to a gentle simmer, stir occasionally, and use a heavy pot. Milk and thick sauces catch easily at higher heat.
**Simmer keeps turning into a boil**
Your burner is set too high or the lid traps too much heat. Lower the heat in small steps and crack the lid to let some steam escape.

## Tips for simmering

**Simmering Best Practices**
+ Boil first, then reduce to a simmer for speed and control
+ Read the bubbles, not the dial number
+ Use a heavy pot for steadier heat
+ Partially cover for long, slow cooking
+ Stir thick sauces to prevent scorching
- Don't let stocks reach a rolling boil (they cloud)
- Don't simmer delicate fish too hard (it falls apart)
- Don't trust "low" on the dial alone (every stove differs)
- Don't walk away from milk-based sauces (they scorch fast)

Simmering is the quiet engine behind most slow-cooked food, from a Sunday [braise](https://fond.kitchen/glossary/braising/) to a clear [stock](https://fond.kitchen/glossary/stock-vs-broth/). Learn to hold a gentle simmer and the gap between home cooking and restaurant results narrows fast.

## Simmering in Fond

Fond's cook mode tells you when a step needs a gentle simmer versus a full boil, so you keep tough cuts tender and stocks clear. Timers handle long braises and reductions, and recipes flag when to cover the pot and when to leave it open to concentrate the liquid.

## Frequently asked questions

**What temperature is a simmer?**
A simmer is about 85-96°C (185-205°F), just below water's boiling point of 100°C at sea level. You'll see small bubbles rising steadily and a gentle ripple on the surface, but not the rapid churn of a full boil.

**What is the difference between simmering and boiling?**
Simmering is gentler, at 85-96°C with small bubbles; boiling is a full 100°C with rapid rolling bubbles. Simmer for stocks, stews, and delicate proteins; boil for pasta, blanching, and hard eggs.

**Should I simmer with the lid on or off?**
Lid on (or partially on) to cook slowly and retain liquid, as for stews and braises. Lid off when you want the liquid to reduce and concentrate, as for pan sauces. A partially covered pot is a useful middle setting.

**What number is a simmer on the stove dial (1-10)?**
There's no universal number, since every stove differs, but a simmer usually lands around medium-low, often 3-4 on a 1-10 dial. Always confirm by looking in the pot for small, steady bubbles rather than trusting the number.

**Why does my stock turn cloudy?**
You boiled it instead of simmering. A rolling boil emulsifies fat and breaks up proteins into the liquid, clouding it. Keep stocks at a bare, gentle simmer and skim the surface for a clear result.

**Can you simmer milk without it burning?**
Yes, but keep the heat low and stir often. Milk scorches easily because its proteins and sugars catch on the bottom of the pot. A gentle simmer in a heavy-bottomed pan, stirred regularly, keeps it from burning.

**Is simmer low or medium heat?**
Usually somewhere between the two. Start on medium-low once the liquid has come to a boil, then adjust: a thin pot on a strong burner may need "low", a heavy pot on a weak one may need "medium". The bubbles decide, not the label.

**How do you know if you are simmering?**
Look at the surface. Small bubbles should rise steadily and break gently, with the surface rippling rather than churning. If it's rolling, you're boiling; if nothing moves for several seconds, you're below a simmer and the food is only poaching.

**How long do you simmer for?**
As long as the recipe needs, which depends on the food: a pan sauce reduces in minutes, beans take 45-90 minutes, a tough braise takes two to three hours. Simmering itself has no fixed time. The temperature stays the same; only the food's cooking time changes.

**What does "bring to a simmer" mean?**
Heat the liquid until small bubbles rise steadily, then hold it there by lowering the heat. You don't need to reach a full boil first, though many recipes ask you to boil and then reduce because it's faster.

---

*Published: 2026-06-22 | Last updated: 2026-09-02*

*Category: techniques*

[View on Fond](https://fond.kitchen/glossary/simmering/)