Add all ingredients to the bowl of a standing electric mixture and turn mixture first on to medium-low, then medium for a minute or two until well-mixed, smooth, and spreadable. Taste and adjust seasonings, including lemon juice. If you’ve a strong arm, do it all by hand. Serve now garnished with the reserved sliced green onions or store tightly covered in the fridge for up to three days. Freezes well for up to a month or so. Thaw overnight in the fridge.