The Lie of "medium-high" heat

guidomerkinsrules said

Like at equal intervals he’s supposed to flip between 5 & 10?

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If someone said they'll get back to you within 5-10 minutes that means it could be 5, 6, 7, 8, 9 or 10 minutes so medium-high heat could mean the same thing. Maybe it's stove dependent and that part isn't mentioned with recipes?