noun
residual heat of freshly cooked food
Used almost exclusively in the phrase 粗熱を取る (to let food cool down after cooking). A cooking term.
See also: 粗熱を取る
茹でた野菜の粗熱を取ってから、サラダに加えます。
Let the boiled vegetables cool down, then add them to the salad.
ケーキの粗熱が取れたら、冷蔵庫で冷やしてください。
Once the cake has cooled to room temperature, please chill it in the refrigerator.
余熱 refers to residual heat in general (e.g., from an oven or engine), while 粗熱 specifically refers to the initial high heat of food just after cooking.
Compound of 粗 (ara, 'coarse' or 'rough') and 熱 (netsu, 'heat'), referring to the rough, intense heat right after cooking.