Lamb Chops with Greens and Sorrel Salsa Verde

Name: Lamb Chops with Greens and Sorrel Salsa Verde
Ingredients: 8 1 1/2-2-thick lamb loin chops (about 3 pounds); Kosher salt, freshly ground pepper; 2/3 cup sorrel or spinach leaves; 1/3 cup mint leaves; 1/3 cup parsley leaves; 1 tablespoon finely grated lemon zest; 1 teaspoon crushed red pepper flakes; 5 garlic cloves, thinly sliced, divided; 1/3 cup plus 2 tablespoons olive oil; 4 ounces king oyster or maitake mushrooms, cut into 1/2 pieces; 1 shallot, thinly sliced; 1 bunch mustard greens, ribs and stems removed, leaves torn into pieces; 1 tablespoon white balsamic vinegar; 1 tablespoon fresh lemon juice (add up to 3 tablespoons total if using spinach)