In a deep pan, fry onion in a little olive oil and butter until translucent.
Add in garlic until fragrant, then pour in stock. Bring to a boil and lower to a fast simmer.
Add risoni and cook for eight minutes.
Add meatballs and cook, turning occasionally for 5-7 minutes.
When meatballs are cooked, stir through baby spinach until it wilts, and season. Add a little lemon juice for added freshness to taste. I probably ended up adding about a tablespoon.
Serve with dollops of natural yoghurt and herbs.