Wash and dry the lettuce ; on chopping board, crumple a few leaves together in your hand and cut thin strips with a knife on a chopping board. Share them among the individual dishes.
Put one goat cheese on each bread slice and pre-heat oven on grill position.
Make your vinaigrette : In a bowl mix salt, pepper, and mustard ; solwly add the vinegar and then the oil, always mixing.
When ready to serve, put the toast and cheese under oven grill for about 5 to 10 minutes ; the cheese should begin to get warm and slightly melt ; in the meantime, pour a bit of vinaigrette on the lettuce strips of each dish.
When cheese is ready, put the toast on lettuce and serve right away.
Decorate with a walnut half or parsley.
I used a roll of Goat cheese and cut thick slices.