First lightly toast the toast slices. If you want to consume the snack warm, fry the turkey breast or heat it in the microwave.
Brush two slices of toast with a little mustard, then with 1 tablespoon remoulade each. Chop the onion into cubes and spread on top. Place three slices of turkey breast and finally a leaf of lettuce and cover the bread with the other slices of bread.
A great, very quick sandwich that really looks good and looks good.