Broad bean

Broad beans grow in groups of up to five plants, and each plant may produce five fistfuls of beans. One fistful of broad beans allows for the planting of four tiles.

Ten fistfuls of broad beans can be cooked into six pounds of broad bean stew

Comment: best crop ever, from v3.18 backward. Turnip is better in term of absolute amount of harvested crop per year and spare seeds for seasonings, but in return it require to double the efforts. With Broadbeans, you just plant it in April, then go do other things. After harvest in July, you are set for that year.