英和和英

a low flame [heat, gas]

弱火にする

〈ガス[電気]こんろを〉 turn down the heat [flame, gas]

〈オーブンを〉 set the oven at ‘low'

弱火で煮る

〈ガス[電気]こんろで〉 cook over [on] a low flame [heat]; cook with the gas [electricity] turned low

〈オーブンで〉 cook in a slow [low] oven; cook with the oven on [turned] low

〈とろとろ〉 simmer; boil gently.