French Onion Soup with Cheesy Dumplings

Ingredients

• 3 tbsp butter
• 1 tbsp rapeseed oil
• 600g onions, finely sliced
• 1½ tbsp Siúcra Granulated Sugar
• 3 garlic cloves chopped
• 2 tbsp plain flour
• 100ml white wine
• 1 litre good quality beef stock
• 120g self-raising flour
• 3 tbsp oil
• ½ tsp salt
• 1 tsp chopped thyme
• 1 egg, beaten
• 70g gruyere cheese, grated
• 3 to 4 tbsp milk
• 12 small thin slices of gruyere cheese