A delightful blueberry sauce with a citrus twist, perfect for topping desserts or breakfast dishes.
Combine the blueberries, cornstarch, sugar, lemon juice, lemon zest, cinnamon, and cardamom in a small pot.
Mix the cornstarch with a bit of water before adding to avoid clumps.
Place the pot over medium heat and cook while stirring until the mixture thickens, about 4 minutes.
Stir constantly to prevent the sauce from sticking to the pot.
Remove the pot from heat and stir in the Grand Marnier.
Adding the Grand Marnier off-heat preserves its flavor.
Let the sauce cool to room temperature before serving.
Cooling allows the flavors to meld together beautifully.