Rack of lamb with ragout of summer vegetables and mint hollandaise

By Matt Tebbutt From Saturday Kitchen Ingredients For the rack of lamb 2 tbsp olive oil 1 x 8-bone rack of lamb, fat scored 1 sprig rosemary 2 garlic cloves, peeled and left whole 100g/3½oz unsalted butter 50ml/2fl oz Madeira wine salt …