Tarte flambee with onions (Thermomix® Cutter)

Dough

• 250 g plain flour, plus extra to dust
• 30 g olive oil, plus extra to grease
• 120 g water
• ¼ tsp salt

Topping and assembly

• 200 g white onion, cut into halves
• 200 g red onion, cut into halves
• 150 g sour cream
• ½ tsp sea salt
• ½ tsp ground black pepper
• 30 g fresh chives, chopped