French Onion Soup

4 tablespoons butter 1 teaspoon salt 2 large red onions, thinly sliced 2 large sweet onions, thinly sliced 1 box chicken broth 1  can beef broth 1 tablespoon Worcestershire sauce Few shakes of parsley flakes  bay leaf 1 tablespoon balsamic vinegar salt and freshly ground black pepper to taste 5-6 thick slices French or Italian bread 10-12 slices Gruyere or Swiss cheese slices, room temperature 1/2 cup shredded Asiago or mozzarella cheese, room temperature 4 pinches paprika

Melt butter in a large pot over medium-high heat. Stir in salt, red onions and sweet onions. Cook 35 minutes, stirring frequently, until onions are caramelized and almost syrupy.

Mix chicken broth, beef broth, parsley, bay leaf and Worcestershire sauce into pot. Simmer over medium heat for 20 minutes, stirring occasionally. Remove and discard the bay leaf. Reduce the heat to low, mix in vinegar and season with salt and pepper. Cover and keep over low heat to stay hot while you prepare the bread.

Preheat oven broiler. Arrange bread slices on a baking sheet and broil 3 minutes, turning once, until well toasted on both sides. Remove from heat; do not turn off broiler.

Arrange 5-6 oven safe bowls or crocks on a rimmed baking sheet. Fill each bowl 2/3 full with hot soup. Top each bowl with 1 slice toasted bread, 2 slice Gruyere cheese and 1/4 of the Asiago or mozzarella cheese. Sprinkle a little bit of paprika over the top of each one.

Broil 5 minutes, or until bubbly and golden brown. As it softens, the cheese will cascade over the sides of the crock and form a beautifully melted crusty seal. Serve immediately!