6 individual ovenproof soup bowls
60 g of butter \ 2 oz
One kg of yellow onions, thinly sliced \ 2 pounds
32 oz - 4 cups Vegetable stock - beef or veal stock stock is classic
Salt and pepper
Baquette cut into half-inch slices
175 g grated Gruyére, or Comtè, Swiss, Provolone \ 3 ounces
30 g melted butter to finish \ 1 oz