Proper shopping and meal prep would eliminate most waste when cooking for two. A lot of perishables are sold by weight so even if, say, the scallions are bundl

Proper shopping and meal prep would eliminate most waste when cooking for two. A lot of perishables are sold by weight so even if, say, the scallions are bundled by the dozen, you only have to buy two not the whole dozen. Also, pick recipes that have perishables in common so that you can be sure to use them all up. Finally, use your freezer. You can, for example, blanch extra veggies that you get on sale and freeze them. It takes practices, but that is part of learning.