Crispy meatball pizza

Name: Crispy meatball pizza
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: European, Italian, Mediterranean
Ingredients: 400g shop-bought or homemade pizza dough defrosted if frozen; plain flour for dusting; 200g leftover sauce (see below); 150g grated mozzarella; 20 leftover meatballs whole or roughly chopped (see below); 1 tsp dried oregano; 2 tsp fennel seeds; ½ tsp chilli flakes (optional); 2 tbsp olive oil plus a drizzle; small handful of green olives roughly chopped; green salad to serve