3 sicilian style potato gratin Recipes

garlic clove, halved, olive oil for brushing plus 4 tbsp, divided, chopped onions, coarse kosher salt, russet potatoes, peeled, very thinly sliced, grated pecorino romano cheese, divided, drained capers, low-salt chicken broth

garlic clove, halved, olive oil for brushing plus 4 tbsp, divided, chopped onions, coarse kosher salt, russet potatoes, peeled, very thinly sliced (i use my mandoline and it makes it a snap to do quickly and uniformly - always use the guard...please), grated pecorino romano cheese, divided, drained capers (i use heaping tbsp because i love capers), low-salt chicken broth