Free simmering timer for sauces soups and reductions. Track low simmer times. Develop deep flavors without burning or boiling over.
Simmering is gentle bubbles breaking the surface occasionally at 180-200°F while boiling is rapid vigorous bubbles at 212°F. I simmer for sauces soups and reductions where I want flavors to develop gently without aggressive evaporation or breaking apart delicate ingredients. Boiling is for pasta or when I need to cook things fast. The visual difference is obvious - simmer is a few lazy bubbles versus boiling is chaos. I usually bring things to a boil first to get temperature up quickly then reduce heat to maintain a gentle simmer. Getting the heat adjustment right takes practice because each burner and pot combination is different.
Most sauces benefit from 20-45 minutes of simmering to develop deep complex flavors through reduction and melding of ingredients. Soups might simmer 30-90 minutes depending on what's in them. Tomato sauce gets better with 1-2 hours of gentle simmering. I start tasting after the minimum time and keep going until flavors are where I want them. Longer isn't always better - delicate vegetables turn to mush and some flavors get muddy or bitter with excessive simmering. My timer helps me track time so I can replicate good results and know when to start checking for doneness.
Covered traps moisture so liquid doesn't reduce much - good when I want to maintain volume like with soup. Uncovered lets liquid evaporate concentrating flavors - essential for reductions and thick sauces. I often start covered to maintain temperature easily then uncover for the last 15-30 minutes to reduce and thicken. Partially covered is a middle ground that lets some evaporation happen while maintaining most liquid. For tomato sauce I go uncovered the whole time to thicken it up. For chicken soup I keep it mostly covered to prevent it from reducing too much. The cover decision dramatically affects final consistency.
Heat is too high or I'm not stirring frequently enough. True simmer should be gentle enough that food barely sticks if at all. I reduce my heat more than I think I need to - it should be the lowest setting that maintains occasional bubbles. I stir every 5-10 minutes scraping the bottom thoroughly to prevent buildup. Using a heavy-bottomed pot distributes heat more evenly preventing hot spots. If sauce is thick adding a splash of water or stock helps prevent burning. Once stuff burns on the bottom that flavor permeates everything so I'm really careful to keep heat low and stir regularly.
Yes oven simmering at 325°F works great for dishes that need long gentle heat like braises and stews. Timing is about the same as stovetop maybe 10-15 minutes longer but oven provides more even all-around heat preventing scorching on the bottom. I don't need to stir as frequently with oven simmering which is nice for lazy cooking days. The oven method is especially good for tough cuts of meat that need 2-3 hours because I can walk away without worrying about heat fluctuations or burning. I use my timer either way but oven simmering is more forgiving and hands-off.