Crumbed Lamb Guard of Honour with Quick Mint Gravy

Name: Crumbed Lamb Guard of Honour with Quick Mint Gravy
Ingredients: 2 x 8 bone racks of lamb, French trimmed (ask your butcher to do this); 1 tbsp. olive oil; 1 tbsp. Dijon mustard; 20 g parsley; Small handful mint sprigs, leaves picked; 1 tbsp. capers, drained; 4 anchovies in oil, drained; 2 garlic cloves, crushed; 1/2 tbsp. red wine vinegar; 25 g chopped roasted hazelnuts; 1 medium egg yolk; 25 g fresh white breadcrumbs; 2 shallots, finely chopped; 1 tbsp. plain four; 300 mL lamb stock; 1 tbsp. mint sauce