Bring 4. 0 cups (32 oz / 907g) of refrigerated heavy cream to approximately 60°F (15°C) by letting it sit at room temperature briefly.
Fit your food processor with a standard metal blade, pour in the heavy cream, secure the lid, and process continuously.
Watch closely as the cream whips; it will get thicker and thicker like custard, and then finally separate into distinct, solid flecks of butter surrounded by liquid buttermilk.
Add 0. 5 cups (4 oz / 115g) of ice water and the 2 cracked ice cubes (2 oz / 56g) directly into the processor to encourage the butter flecks to instantly clump into large, solid lumps.
Strain off all the liquid buttermilk from the bowl, leaving only the solid butter behind.
Knead the butter using your hands or work it with two grooved wooden butter paddles to squeeze out any remaining milky whey until the butter mass becomes completely clean and compact.
Rinse the compact block of butter under very cold running water to remove the final traces of whey, ensuring your butter stays fresh longer.
Knead in 0. 1 to 0. 5 tsp (0. 1 oz / 3g) of salt if you desire a salted flavor, otherwise leave it unsalted.
Store the butter in a well-sealed container in the refrigerator, or keep it frozen for up to 3 months. ## Nutritional Information (Per 1 tbsp / 14g / 0.49 oz serving)
Calories: 100 kcal
Carbs: 0g
Protein: 0g
Fat: 11g (Note: Nutritional values are approximate and may vary slightly based on the specific brand and fat percentage of the heavy cream used.)