Braised Lamb with balsamic

olive oil 4 lamb fillets (you could also use one large fillet of about 600g if that is all you can get.) 1 small leek , finely diced 3 garlic cloves , crushed[...]

1 1/2 tablespoons vegetable oil 3 carrots , thinly sliced 2 onions , thinly sliced 2 celery ribs , thinly sliced 4 garlic , minced 1 teaspoon rosemary 1[...]