I wonder if this function is a bit glitchy. The other day I was trying to drag meat onto dough to make a meat pie, and also fish to make the fish pie, but it wasn't working. If I put the filter on for "only ingredients", dough wasn't showing up despite clearly being an ingredient.
What about meat, though? I tried raw meat and dough. Also, and sorry, this is getting really OT, but I'm surprised that certain things don't make anything, like combining "ham" and "bread".