Place the canned tuna, including the oil, in a bowl.

Add roasted red bell pepper, parsley, sliced almonds, and onion.

Add KEWPIE Salad Dressing Roasted Sesame, then gently mix with a fork until all ingredients are well combined. Be careful not to break up the tuna too much.

Season with salt and ground black pepper to taste, then mix again until evenly combined.

Wash the cup-shaped baby cos lettuce leaves and arrange them on a plate. Spoon the salad mixture onto the lettuce leaves. Serve.