Osia Steak & Seafood Grill. Located at 26 Sentosa Gateway, Festive Walk, #02-140/141, Singapore 098138. 1 Michelin ️ Restaurant. Osia’s Signature Dessert – Hot Chocolate Soup / Black Peppered Ice cream / Sesame Crisp. Pipping hot bowl of chocolate soup just melts our heart! ️ Love it! @osiarestaurant @rwsdiningartisans @rwsentosa #hungryunicornsg #osiarestaurant #osiasteakandseafoodgrill #hotchocolatesoup #chocolatesoup