Cauliflower Cheese Pithivier | Cauliflower Recipes | Tesco Real Food

Ingredients

• ½ tbsp olive oil
• 2 red onions, sliced
• 2 tsp balsamic vinegar
• 1 tsp dark brown sugar
• 1 tsp fresh thyme leaves
• 600g cauliflower, broken into florets
• 40g unsalted butter
• 1 tbsp flour, plus extra for dusting
• 300ml milk
• 100g strong Cheddar, grated
• 375g (about 3) leeks, trimmed and sliced
• 2 x 375g packs ready-rolled light puff pastry
• 1 egg, beaten