Combine the natto with the included sauce, grainy mustard, mayonnaise, and black pepper. Spread margarine on the bread.
Top the bread spread with margarine with the combined natto ingredients from Step 1 and top with the cheese. Toast it. Optionally sprinkle with more black pepper and it's done.
Story Behind this Recipe
Sometimes I want to eat this natto toast. The seasonings match the toast really well.
If you worry about the calories, you can omit the margarine But adding it creates a richer flavor. If you're not a huge fan of natto, it will probably be easier to eat if you add more mayonnaise and margarine, and top with ketchup. Mixing mayonnaise with the natto prevents it from hardening. Even after toasting it, it remains fluffy.