These cheese toasts are great with any kind of strong hard cheese and pair well with tomato soup.

1 tablespoon oil
1 onion sliced
Salt
Pinch sugar
Whole wheat bread
Butter
Red chili flakes
Aged Gouda thinly sliced (or other aged or strong hard cheese)

1. Heat oil in a skillet and saute onions until caramelized adding salt and sugar part way through. It takes a while to get the onions really soft and falling apart, but it is worth it.
2. Spread bread with very thin layer of butter.
3. Top with caramelized onions, chili flakes and Gouda.
4. Serve with soup!