Fried Cauliflower with Tangy Dipping Sauce

Name: Fried Cauliflower with Tangy Dipping Sauce
Ingredients: 3 tablespoons Asian fish sauce; 2 tablespoons fresh lime juice; 1 tablespoon sugar; 1 garlic clove, minced; 1 to 2 Thai chiles, thinly sliced; 1 1/2 cups cornstarch; 1 cup all-purpose flour; 2 teaspoons cayenne pepper; 1 teaspoon baking powder; Salt; 12 ounces pale lager; 1 large egg white; Canola oil, for frying; 1 head of cauliflower—halved, cored and cut into 1-inch florets; 2 tablespoons chopped mint; 2 tablespoons very thinly sliced jalapeño