Step 1

Line a baking tray with non-stick baking paper. Place the mince, carrot, zucchini and tomato sauce in a large bowl. Use your hands to mix until well combined. Roll 1 heaped tablespoonful of mince mixture into a ball. Place on the lined tray. Repeat with the remaining mince mixture.

Step 2

Place a large non-stick frying pan over medium heat. Add meatballs and cook, turning, for 4-5 minutes or until cooked through. Transfer to a plate to cool slightly. Cut the meatballs in half.

Step 3

Spread half the bread with avocado. Top with meatball, tomato and lettuce. Spread the remaining bread with the hummus and sandwich together. Cut sandwiches in half. Wrap in plastic wrap.