Preheat oven to 250°F. Place garlic cloves in a ramekin and pour olive in until cloves are covered. Place rosemary on top, put lid on and bake for 1 hour.
Half way through the garlic bake, fire up the grill to a medium heat (325°F). Cut baguette in half and season steak with salt and pepper (or your favorite seasonings).
Coat bread with olive oil and place bread and steak on the grill. Bread should be flat side down on the grill grates.
Remove bread once toasted. Remove steak once it reaches a temperature of 130°F (medium rare). Put steak aside to rest.
Remove garlic confit from oven. Spread garlic cloves over the bread. Then, spread Boursin cheese over the garlic confit.
Slice steak and place slices onto of bread. Cut baguette into bite size pieces and enjoy! Top with chopped rosemary to elevate your appetizer.