Lottie's Cheeseburger Steamed Buns recipe - The Great British Bake Off

Ingredients

• 300g plain flour, plus extra for dusting
• 20g caster sugar
• 1 tsp instant dried yeast
• 1 tsp baking powder
• 1 tbsp vegetable oil
• 1 tsp fine salt
• 170ml lukewarm water
• Green and red food-colouring gels
• 1 tbsp whole milk, for brushing
• 2 tbsp black and white sesame seeds, to decorate
• 250g 5%-fat minced beef
• 1 tbsp onion granules
• ½ tsp garlic powder
• 1 small red onion
• 1 tsp vegetable oil
• 4 rashers of unsmoked back bacon
• 4 slices processed cheese singles
• 4 cornichons
• 4 sundried tomatoes, in oil, drained and patted dry
• Salt and freshly ground black pepper
• 10cm squares of baking paper x 10
• 5cm round cookie cutter
• Saucepan with a steamer-basket insert, or two-tiered bamboo steamer