Chickpeas
The most useful thing in the cupboard: 8.9 g of protein and 7.6 g of fibre per 100 g cooked, and it keeps for years.
Ingredients
One page per ingredient: what is in it with the source cited, how to pick a good one, how to store it, what to use when you have none — and every recipe here that uses it.
Greek yogurt
Straining roughly doubles the protein per spoonful and removes most of the lactose. That is the entire difference.
Red bell pepper
127.7 mg of vitamin C per 100 g, more than twice what an orange carries. It is also nothing more exotic than a green pepper that nobody picked.
Zucchini
Ninety-five percent water, which is the whole problem and the whole opportunity. Salt it and it browns; skip that and it steams.