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Heat heavy cream to room temperature in a small saucepan. Remove from heat and add buttermilk. Stir and pour into a jar and seal (I use a mason jar).
Keep jar in warm place (on counter or on top of refrigerator) for 12-24 hours.
Add lime juice, salt and seal again. Shake to mix until well combined.
Keep refrigerated or use right away. Good refrigerated for up to 2 weeks.