Grilled Lamb with Pistachio Crust - Icelandic Lamb

Ingredients

• 2 x 200 g lamb steak
• 2 tbsp olive oil
• salt and pepper
• 1 1/2 sweet potatoes, large
• 2 tbsp. olive oil
• 4 cloves garlic, whole
• 100 ml double cream
• 50 g pistachios, chopped
• 3 cloves garlic, finely chopped
• 3 tbsp. breadcrumbs
• 1 tbsp. olive oil
• 3 sprigs of fresh thyme, finely chopped
• 1 lemon, zest and juice
• 1 tbsp. dijon mustard
• 3 spring onions
• 2 tbsp. oil