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Photo, Sian Richards.
The key to this delicious butter is using yogurt that contains no gelatin. Check the ingredients list to be sure.
2 cups 35% cream
1/4 cup gelatin-free plain 2% yogurt, with active cultures
1/2 tsp flaked sea salt, preferably Maldon
STIR cream with yogurt in a medium bowl until combined. Cover with plastic wrap and let stand, at room temperature, until thickened and slightly sour, 12 to 18 hours.
WHISK cream mixture in a stand mixer on medium-low until the buttermilk separates from the butter, 7 to 8 min. Transfer to a fine-mesh strainer set over a large bowl and drain well, reserving buttermilk for another use. Rinse butter under cold running water. Use a spatula to fold and press remaining buttermilk and water out of butter. Transfer to a small bowl. Stir in salt. Use immediately or refrigerate, covered, up to 2 weeks.
Calories 93, Fat 10g, Sodium 50mg.