Place the steamer attachment into the KitchenAid Smart Oven+ with Powered Attachments and fill it to the line with water. Place in the perforated pan and place a few savoy cabbage leaves down.
Place on the lid and heat until it begins to steam. Season the inside and outside of the fish with salt and pepper. Stuff the cavity of the fish with lemon slices.
When the fish is done cooking, remove it from the steamer and place on a serving platter. Garnish with peppers, onions, green onions, cucumber, cilantro, and sauce.