Place the blueberries and lemon juice in a small saucepan and set over medium heat. Bring to a boil, then lower the heat to maintain a low simmer for 5 minutes. Remove from the heat.
Transfer the mixture to a blender or a food processor and puree until smooth, or use a hand blender to puree the mixture straight into the saucepan.
Strain the blueberry juice through a fine-mesh strainer and discard the solids. Measure out ¾ cup (175 ml) of blueberry juice (keep the remaining juice, if any, to add to a smoothie or overnight oats!). Return the blueberry juice to the saucepan, stir in the sugar, and set over medium heat. Cook, stirring, until the sugar is fully dissolved, about 2 minutes. Turn the heat off.
In a medium bowl, whisk the eggs together. While whisking constantly, slowly pour about ½ cup (125 ml) of the hot blueberry mixture into the eggs. Keep whisking while slowly pour the rest of the hot blueberry mixture into the eggs.
Return the blueberry mixture back into the saucepan and set over medium-low heat. Simmer, whisking constantly, until the mixture becomes thick like a soft pudding. (Make sure to whisk constantly so the mixture doesn’t stick to the bottom of the pan and burn.)
Remove the blueberry curd from the heat. Whisk in the butter, then transfer to a glass jar. Let cool completely, then refrigerate overnight.
SERVING: Spoon blueberry curd over anything and everything: crêpes, waffles, pancakes, scones, croissants, buttered toast, and English muffins. You can also add it to desserts: spoon it over gelato or yogurt, serve it with angel food cake along with fresh berries and whipped cream, fill up a baked pie crust and top it with toasted meringue, or add it to a trifle for a spectacular result.
STORAGE: Blueberry curd can be refrigerated for up to 1 week.
MAKE IT DAIRY-FREE: Use vegan butter instead of dairy butter to finish up the blueberry curd.
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