Heat a non-stick frying pan over high heat for 2 minutes. Combine fajita seasoning & oil in a bowl. Add lamb & toss to coat. Add half of the seasoned lamb to very hot pan. Sizzle for 40 seconds before turning & cook for a further minute. Remove from pan & repeat with remaining lamb. Return all cooked lamb to pan. Add onion, cook for 2 minutes & squeeze over lime juice.
Warm to separate tortillas. Open tortilla pouch, discard freshness sachet. Microwave tortillas in pouch on HIGH/1100 watts/100% power for 30 seconds or remove from pouch, wrap in foil & heat in oven at 180°C for 10 minutes.
Combine yogurt and mint. Place lamb & onion onto warmed Tortilla. Top with lettuce, cherry tomatoes & mint yogurt. Wrap and enjoy.