Mediterranean beef meatballs - AustralianFarmers

Ingredients

• 500g lean beef mince
• 1 small red onion, finely diced
• 1 ½ tbsp oregano leaves, finely chopped + extra sprigs, to serve
• Zest of 1 lemon + extra wedges, to serve
• 1 tbsp olive oil
• 400g tomato passata
• ½ cup (125ml) salt-reduced beef stock
• 2 zucchini, cut into 1cm dice
• 2 celery stalks, cut into 1cm dice
• 2 carrots, peeled, cut into 1cm dice
• 80g baby spinach leaves
• 60g feta cheese, crumbled