1. Bring a pot of salted water to a boil.
Peel and cut the potatoes into pieces and immerse them in the boiling water for 25 minutes (until they can be mashed).
2. In a sauté pan, heat a drizzle of olive oil over medium-high heat.
Sauté the onion (peeled and minced) with the ham (in pieces) for about 7 minutes until caramelized.
3. Cut the Munster cheese into pieces (optional).
Once the potatoes are cooked, drain them and mash them with a fork or a potato masher. Season with salt and pepper.
Squeeze the garlic, add it to the mashed potatoes, and crumble the bouquet garni into it with your hands.
You can add a splash of milk and a knob of butter for a creamier mashed potatoes.
Add the ham/onion mixture to the mashed potatoes and the Munster cheese (optional). Mix well.
4. Coarsely chop the sucrine lettuce.
In a salad bowl, pour the mustard, olive oil, and vinegar. Mix well to obtain a vinaigrette.
5. Just before serving, add the sucrine lettuce to the salad bowl. Season with salt and pepper, and serve with the mashed potatoes.