Making time: 5 minutes
Cooking time: 35 minutes + 15 minutes in the oven
Total time: about 1 hour
Ingredients (2 people):
2 onions (13 oz-370 g)
1.8 oz (50 g) butter
2 cloves of garlic
1 spoon flour
750 ml stock
2 slices of sanwich loaf
1.8 oz (50 g) grated Parmesan cheese
1 sheet puff pastry