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*If it is strawberry season and you have access to good local berries, you may freeze fresh strawberries to use. Freezing causes the cell membranes in the berries to rupture, and they will release more juice, so don't be tempted to skip this step!
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**I prefer the flavor of curd made with the regular balsamic, but you may prefer the pinker color of the curd made with white/golden balsamic instead.
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Combine strawberries, balsamic, and 1 teaspoon sugar in a bowl. Allow berries to thaw completely, stirring once or twice. This will take several hours.
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Transfer the berries and liquid to a mesh strainer set over a 4-cup glass measure. Scrape the bowl with a silicone spatula to get as much liquid as possible. Press the berries to mash them a bit and extract more juice. Allow to strain at least 15 minutes. There should be about a cup of strawberry-balsamic liquid in the measure.
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Transfer the strained berries to a food processor, and process to a smooth puree. Set aside.
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Microwave the liquid on high until reduced to 1/3 to 3/8 cup. Set the microwave for 4 or 5 minutes to start, then microwave in 1 to 2 minute bursts, allowing the boiling to subside to check the liquid's volume between bursts. It will likely take a total of 8 to 9 minutes, but will vary based on your microwave. The vinegar seems to prevent the bubbling from going over the 3 cup mark, but keep a relatively close eye on the process nonetheless.
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Whisk the egg yolks and sugar together in a medium saucepan. Slowly whisk in the reduced strawberry-balsamic liquid, then add the butter, salt, and 1/4 cup of the strawberry puree. Cook over medium-low heat, stirring and scraping the bottom continuously with a silicone spatula or wooden spoon. Once the mixture starts to steam, begin checking the temperature. Continue cooking until the mixture reaches 170u00b0 F. Remove the pan from the heat, and stir in the remaining strawberry puree. Return the pan to the heat and cook for 30 seconds, stirring continuously.
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Pass curd through a strainer -- fine mesh if you don't want strawberry seeds in the final mixure, or medium-fine mesh if you do want the seeds -- into a bowl or storage container. Use a silicone spatula or wooden spoon to press the mixture through the strainer, so only the coarse bits remain. Cool, then cover and chill. Serve as desired with fresh berries, on ice cream or yogurt, slathered on toasted pound cake, or whatever creative use you think up!
