Allow whipping cream to sit out for 30–45 minutes*. Add whipping cream to FourSide jar and secure lid. Blend on Speed 2 for 15–20 seconds.
Use spatula to move whipped cream toward center of jar, and then secure lid. Pulse for 2–3 seconds. Use spatula to push whipped cream toward center of jar and then pulse 10–12 times. Repeat process until buttermilk separates from butter curds.
*Using cold cream to make butter will require more time to churn and transform to butter.
For cilantro lime butter, add ¼ cup fresh cilantro leaves, 2 teaspoons lime zest, and ½ teaspoon sea salt toward end of pulsing process. For honey butter, add ⅓ cup honey and stir or pulse into butter.