Preheat the oven to 200°C and grease a non-stick baking tray.
Finely chop the spring onions and crush the garlic, mix these with the minced Lamb, rosemary, egg and breadcrumbs
Mix together all the ingredients for the meatballs and season well with salt and pepper.
Pinch off small cherry-sized pieces of the mince mixture, roll into balls and arrange on the baking tray with space between each one. Drizzle with a little olive oil, then cook in the hot oven for about 20 minutes. Shake the tray half way through to help the meat balls brown.
Put a large pan of lightly salted water on to boil, while you chop up the tomatoes. Cook the pasta according to the timing given on the pack, drain then mix with the tomatoes and peas, roughly crumble the feta and tear the mint leaves and add these to the pasta and a little extra olive oil if you wish.
Check the meatballs are cooked through then toss them and any pan juices in with the pasta mixture and serve straight away.