Low FODMAP meatballs in tomato sauce

Name: Low FODMAP meatballs in tomato sauce
Prep time: 25 min
Total time: 25 min
Cuisine: American
Ingredients: 500 g minced meat (50% pork, 50% beef); 1 tbsp mustard (choose a low FODMAP version); 1 egg; 1 tbsp oat flour or gluten-free breadcrumbs; 1 tsp cumin; 1 tsp smoked paprika; 1/2 tsp cayenne pepper; Pepper and salt; 2 stalks of spring onion, the green part only; 500 ml stock (make sure to pick a low FODMAP version); 500 ml stock; 2 tbsp olive oil; 2 tbsp gluten-free flour; 1 can of pureed tomato (70 g); 1 tsp chilli powder; ½ tsp cumin; ½ tsp oregano; A pinch of salt