Pull-Apart Mini Pizza Sandwiches

Ingredients

• 1 can (14 oz/398 ml) diced tomatoes, drained
• 2 garlic cloves, finely grated
• 2 tbsp (30 ml) tomato paste
• 1 tbsp (15 ml) olive oil, plus more for brushing
• 1 tbsp dried black olives, pitted and chopped (optional)
• 1 tsp dried oregano, plus more for sprinkling
• ¼ tsp red pepper flakes
• 12 mini brioche hamburger buns, pulled apart and cut in half horizontally
• 3 oz (85 g) pepperoni slices
• ½ cup (140 g) store-bought roasted bell peppers, drained and coarsely chopped
• 1 ½ cups (150 g) mozzarella cheese, grated
• 24 basil leaves