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½ cup white wine
1 shallot, thinly sliced
1 tablespoon water
3 egg yolks
1 tablespoon apple cider vinegar
8 ounces butter
4 five-ounce beef patties, ½ inch thick
Salt and freshly cracked black pepper to taste
4 slices Saint-Nectaire cheese
8 pieces wild boar bacon
4 crusty hamburger rolls (ciabatta if possible)
Aioli or mayonnaise
4 Boston lettuce leaves
For Béarnaise Sauce:
In saucepot, cook wine and shallot pieces on medium-high heat, until they become amber in color.
Strain through a fine sieve into a 2-quart mixing bowl.
Fill saucepot with water and return to medium high heat; bring to simmer.
Add water, egg yolks and apple cider vinegar to wine reduction in the mixing bowl.
Place mixing bowl over simmering water and whisk to combine.
Slowly pour melted butter into mixture while whisking.
Continue to cook sauce over simmering water until mixture thickens; do not cook for too long or eggs will scramble.
Remove bowl of sauce from water bath and store in a warm place.
Start charcoal or gas grill prior to use so it is sufficiently hot for grilling.
Oil grill surface lightly; the oil should smoke slightly.
Season patties with salt and pepper, place on grill and grill for 60 seconds.
Carefully lift and turn burgers 90 degrees and grill for another 60 seconds.
Flip burgers; cook for 60 seconds.
Turn 90 degrees again and add the cheese and wild boar bacon (1 slice and 2 pieces, respectively, for each burger).
Cook for 60 seconds more; the cheese will melt while the burgers finish.
Remove patties from heat, place on a warm plate and let rest for 2 minutes.
Toast rolls over coals or grill and spread with aioli or mayonnaise.
Place burgers on rolls and top with 2 ounces béarnaise sauce each.
Finish with lettuce leaves and enjoy.