Grate rind finely from lemon and squeeze juice; you will need 1 teaspoon rind and 1 tablespoon juice. Place lamb cutlets in large bowl with rind, juice, paste, yogurt and sugar. Cover stand 10 minutes. Cook lamb on heated oiled grill plate (or grill or barbecue )until browned both sids and cooked as desired. Serve with steamed basmati rice and lemon wedges, if desired.