Strengthen with some compatible materials, but each strengthening can only improve one or two points, so choose cheap materials and prepare more. For example, super sushi, the strengthening effect of soy sauce is the same as that of pesticide-free rice, but soy sauce is much cheaper, so when I see a businessman selling soy sauce there, I buy it for later use. I suggest you don't sell the cheap dishes on the menu, only pick the most expensive one or two dishes to sell, so that you can get the money faster. After all, the materials are very expensive.