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1
Combine water and sugar in a heavy-bottomed saucepan. Stir to begin dissolving the sugar.
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2
Whisk the cornstarch into a small quantity of the measured cool water to form a smooth slurry before adding to the pan.
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3
Add diced pineapple and the cornstarch slurry to the sugar-water mixture.
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4
Cook over medium heat, stirring constantly, until the mixture reaches a full simmer (100°C / 212°F) and thickens to a cohesive, spoonable mass that holds its shape.
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5
Continue stirring until the filling pulls from the sides of the pan and the raw starch taste is gone.
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6
Transfer to a clean container. Cool completely before using as a filling.