French Onion Soup

This is a perfect and light supper meal for any time of the year. It needs only 4 ingredients that are easily found in any kitchen. It is rich and filling, and at the same time very healthy. It takes about 60 minutes to make, but you don't need to be watching it all the time.

Ingredients for 4:
3 large onions, sliced finely
1500 ml stock
6-7 slices of stale french bread
100 gm grated cheese

Heat two tablespoons of olive oil in a large pan that can go in the oven; add a large pinch of salt and another pinch of sugar; cover the pan and fry the onions over a low heat for 25-30 minutes. This is the most important part of this recipe. The onions must brown and start to caramelize. Stir the onions 3-4 times while they are cooking.
When the onions are soft and brown, add the stock and bring to the boil. Simmer for 15 minutes.

Turn the oven grill on to 180ºC.
Arrange the bread slices over the soup so that they don't overlap. Sprinkle the cheese evenly over the bread slices.
Place the soup under the grill in the oven and bake for 15 minutes until the cheese is bubbling.