Shrimp and Ginger Siu Mai Dumplings

Name: Shrimp and Ginger Siu Mai Dumplings
Ingredients: 1 pound shrimp, shelled and deveined; 1/2 pound ground pork; 1 green onion, finely chopped; 3 garlic cloves, minced; 1 (2-inch) piece fresh ginger, grated; 2 egg whites; 2 teaspoons cornstarch; 1/2 lemon, juiced; 1 tablespoon low-sodium soy sauce, plus some for dipping; 1 tablespoon sesame oil; 1/4 teaspoon salt; 1/4 teaspoon ground black pepper; 1 (10-ounce) package round wonton wrappers; Canola oil, for brushing the steamer; Savoy cabbage, for lining the steamer, optional; Micro Arugula, for garnish