Hawaiian Garlic Shrimp Sliders

Name: Hawaiian Garlic Shrimp Sliders
Ingredients: 2 heads garlic, peeled (about 20 cloves; see Cook’s Note); 1 stick (8 tablespoons) unsalted butter; 2 teaspoons paprika; 1/2 teaspoon cayenne pepper; Kosher salt; 4 cups shredded napa cabbage (about 1/4 head); 6 scallions, sliced; 1 Persian cucumber, halved lengthwise and sliced into half-moons; 2 tablespoons rice vinegar; 3 tablespoons vegetable oil; 1 1/2 pounds peeled and deveined shrimp; One 10-ounce package sweet slider buns; Mayonnaise, preferably Japanese-style, for serving