INGREDIENTS
25 g
butter
4
onions, halved and sliced
3 cloves
garlic, minced
2 tbsp
balsamic vinegar
2 tbsp
sugar
3 tbsp
plain flour
200 milliliters
vegetarian beer
350 milliliters
vegetable stock
1 tsp
dried thyme
Black pepper
White baguette, sliced, to serve
Cheese, to serve (I used mozzarella, but gruyère is more traditional)