Case Size: 50/250 g. Two Happy Swallow Belacan Shrimp Paste is a pungent, savory paste used in Southeast Asian cooking. Two Happy Swallow Belacan Shrimp Paste (250 g) is a rich, flavorful paste made from fermented shrimp. It is commonly used in Southeast Asian dishes, adding a deep, savory umami flavor to curries, sauces, and stir-fries.