Place fish in a baking dish that fits inside a large steamer basket or on a rack that will fit into a large frying pan. Combine the soy sauce and white wine or lemon juice and pour over the fish. Top with ginger and carrot.
Fill pan with water to a depth of 2.5 cm. Bring to a simmer. Place steamer basket or wire rack in pan. Place baking dish in the basket or on the rack. Cover pan or basket. Steam fish for 5 to 6 minutes. Add snow peas and capsicum to baking dish. Cover. Steam until fish flakes when touched with the tip of a knife and vegetables are crisp-tender, about 5 minutes.