Ensure butter is softened to room temperature for a smooth, fluffy mixture., Use a potato masher and fork to crush berries thoroughly before straining., Powdered sugar blends better than granulated sugar for a smooth texture., If using nondairy butter, expect initial separation; continue beating to combine., Store finished butter chilled to maintain freshness., Use salted butter or add flaky sea salt for a salty-sweet flavor twist., Try flavor variations by swapping berries, adding citrus zest, spices, or sweeteners such as honey or maple syrup., Freeze in portioned containers or logs wrapped in parchment for up to 6 months, and thaw in the refrigerator before use.