INGREDIENTS
8 oz
sliced cremini mushrooms
1 tbsp
unsalted butter
1 tbsp
olive oil
3
garlic cloves, minced or pressed
1 pinch
salt + pepper
4
slices whole grain bread
6 oz
fontina cheese, freshly grated
mustard aioli
1 1/2 tbsp
dijon mustard
1
large egg yolk
2 tsp
fresh lemon juice
1/2 cup
olive oil
2 tbsp
whole grain mustard
1 tbsp
horseradish
1 pinch
salt + pepper