Mix the butter in a large bowl, either using a hand mixer or a soft spatula. Mix until creamy. Add in the grated radishes and mix until combined. Add a big pinch of salt and pepper. Stir until combined and the radishes are fully incorporated into the butter. Don’t worry if the butter separates a bit from the radishes - this ideally works as a “” and not a “dip.” You want the mixture to be spreadable on crackers!