The phrase "proof bowl" refers to a situation or scenario where someone is trying to provide evidence or proof to support their claim or argument. Full definition
Gently melt the coconut oil by placing in a small heat proof bowl set over a pan of steaming water with the heat turned off. (swoonfood.com)
Place a heat proof bowl over top of the pot and add the chocolate to the bowl. (spiceandsprout.com)
To gently melt the coconut oil and raw cacao butter, place them in a heat proof bowl set over a pan of steaming water with the heat turned off. (swoonfood.com)