Start with the cooking method you planned (pan-fry, bake, or poach) and match the substitute’s flake behavior: thin, flaky fillets are easiest.
Use the table ratio: for 1:1 swaps, replace sole directly; for denser options, use the reduced ratio and slice thinner if possible.
Keep cooking time conservative—pull the fish as soon as it turns opaque and flakes gently with a fork.
If the substitute is leaner than sole, add a small moisture buffer (butter drizzle, splash of stock, or a light sauce) during the last minutes.
Taste and adjust seasoning at the end (salt + a squeeze of lemon or light vinegar) to restore sole’s clean, mild finish.