Finely chop 300 grams of pineapple and blend to extract the juice. If you don’t have enough, add more pineapple to make 300 grams (about 1 1/4 cups) of juice.

Add the pineapple juice to the flour mixture and stir until smooth. Strain the batter to remove any lumps. Bring water to a boil in a steamer. Grease the molds and preheat them in the steamer. Pour the batter into the hot molds, filling them to the top. Steam over high heat. The cakes will gradually rise; steam for about 15 to 20 minutes. Check doneness by inserting a toothpick—if it comes out clean, the cakes are done. Remove from the steamer, let cool, and take the cakes out of the molds.