While the basic blueberry compote mixture in this recipe includes just blueberries, sugar, and lemon juice, there are many ways to enhance its flavor profile. For example, adding a splash of brandy or rum during the cooking process can introduce complexity. Fresh spices like a pinch of cinnamon or nutmeg can provide warmth and depth. For a hint of freshness, consider adding finely grated citrus zest, like lemon or orange, to the mix. If you enjoy a bit of heat, a small amount of fresh ginger can introduce an interesting kick. Finally, for an additional layer of texture, you could mix in some chopped nuts or a swirl of cream cheese combined with the blueberry mixture before spooning it into the tartlet shells.