While I don't usually cook sweet cherries, I love this combination of the sweet, light-colored Rainier cherries with the tangy orange apricots. Alone, Rainier cherries don't have a very strong flavor, but their subtle sweetness mellows the apricots. This filling is on the tart-and-tangy side, so may want to add up to 200 g (1 cup) of sugar if you prefer things sweeter. The tiny bit of almond extract really amps up the flavor of this filling.