Clean the gizzards thoroughly under cold water
Trim off any excess fat, membranes, or tough bits
Soak in salted water or vinegar water for 15 to 30 minutes if desired
Rinse again and drain well
Place gizzards in a pot and cover with water
Add salt and optional aromatics like onion, garlic, or bay leaf
Bring to a boil
Reduce to a simmer
Cook until tender, about 1.5 to 2.5 hours
Check tenderness with a fork
Drain and let cool slightly
Slice or leave whole as needed
Season and cook further by frying, sautéing, grilling, or adding to stew
Serve hot