Take a heavy casserole dish and place on hotplate. Add 2 tbsp. olive oil and fry shallots or onions over high heat until golden.
Remove onions from casserole and now fry sausages until lightly browned. Remove sausages from casserole.
Add remaining olive oil and fry potatoes until lightly browned. Don’t worry if anything sticks to the bottom of the casserole, this will add flavour. While the potatoes are browning, chop sausages into 5 or 6 slices each.
Add sausages, onion, wine or beer, herbs and salt to the potatoes. Cover and place in pre-heated oven and cook for 40 minutes.
Before serving add a tbsp. of Dijon Mustard and a few grinds of black pepper. Stir and serve.