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"I use a thermometer to tell me when the oil is ready to use. If however you don't have a thermometer, you can use small scraps of dough to see if it's ready. After about 20 minutes or so of heating up, throw in a small scrap of dough. If it rises to the top immediately, then the oil is ready to use. "
<https://alpineella.com/brioche-doughnuts/>