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First make the meatballs. Tip the mince into a bowl, add the oats, spring onions, spices and the coriander stalks, then lightly knead the ingredients together until well mixed. Shape into 12 ping-pong- sized balls. Heat the oil in a non-stick frying pan, add the meatballs and cook, turning them frequently, until golden. Remove from the pan.
Tip the onion and garlic into the pan with the pepper and stir-fry until softened. Stir in the cumin and chilli paste, then pour in the stock. Return the meatballs to the pan and cook, covered, over a low heat for 10 mins. Stir in the tomatoes and beans, and cook, uncovered, for a few mins more. Toss the avocado chunks in the lime juice and serve the meatballs topped with the avocado and coriander leaves.