Grilled Ginger Margarita Swordfish with Tequila Lime and Orange Zest Homemade Butter

Name: Grilled Ginger Margarita Swordfish with Tequila Lime and Orange Zest Homemade Butter
Ingredients: 1 tablespoon chopped red onion; 1 teaspoon chopped flat leaf parsley; 1 teaspoon lime zest; 1/2 cup whipping cream; 1/2 teaspoon fresh ground white pepper; 1/2 teaspoon reposado tequila; 1/2 teaspoon valencia orange zest; 1/4 teaspoon Cointreau; 1/8 cup fresh lime juice; 1/8 teaspoon fresh grated ginger; 24 ounces harpoon caught swordfish steaks; a few drops of fresh lime and orange juice; lime wedges, an orange wedge, and parsley for garnish; pinch of kosher salt