Salt Cod Brandade

Name: Salt Cod Brandade
Ingredients: 8 oz. dried salt cod; 1 large red or Yukon Gold potato (about 8 oz.), scrubbed; 4 garlic cloves, smashed; ¾ cup whole milk; 1 baguette, sliced ¼ thick; 6 Tbsp. extra-virgin olive oil, plus more for drizzling; Kosher salt; ½ tsp. freshly ground pepper, plus more; 1 tsp. finely grated lemon zest; 1 Tbsp. fresh lemon juice; ⅛ tsp. cayenne pepper; 2 Tbsp. finely grated Parmesan