Originally only of eggs: slightly or imperfectly cooked, underdone. Also in extended use. Cf. rare, adj.2 Now regional.

Of an egg: left soft in cooking, lightly cooked.

Of food or a meal: spoiled by overcooking; overdone. Also occasionally: undercooked; = sam-sodden n. at sam-, prefix affix 2.

That has been cooked al dente; tender but firm.