Oven at 180c Fan
Slice leeks into ~3cm slices
Peel and mince garlic
Add peas, leeks, garlic, dill, vermouth, oil and half the salt to a large roasting tin and mix well
Arrange chicken thighs on top, skin side up
Drizzle with some more olive oil and sprinkle with the remaining salt
Roast in the oven for 75 minutes
Serve with potatoes or bread