Spicy Shrimp and Pork Meatballs with Rujak Sauce

Meatballs:

• 1/2 pound shrimp, peeled and deveined
• 4 green onions, diced
• 1 (2-inch) finger fresh ginger, finely chopped
• 2 cloves garlic, crushed
• 1 to 2 serrano peppers, seeded and chopped
• 1 pound ground pork
• 1 egg
• 3 tablespoons tamari sauce
• 1/4 cup chopped fresh cilantro leaves
• 1 lime, zested and juiced
• 1/4 cup peanut oil

Sauce:

• 1 mango, peeled and flesh chopped
• 1 star fruit, chopped
• 1 Asian pear, seeds removed and chopped
• 3 tablespoons palm sugar or piloncillo (Mexican brown sugar)
• 1/4 cup tamarind juice, or 2 tablespoons tamarind paste dissolved in 1/4 cup water
• 1/2 teaspoon red pepper flakes