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Take 250 g butter out of the fridge in advance so it softens. Finely chop the shallot.
Sauté the shallot in 1 tsp butter over medium heat for 1–2 minutes until translucent, then let it cool completely. (Raw = more intense flavor.)
Thoroughly mix softened butter with 2 tablespoons of "Truffle Shuffle", the (cooled) shallot, and 60 g of shaved Parmesan in a bowl.
Taste briefly and adjust with a pinch of salt if needed.
Place the mixture on plastic wrap, shape it into a firm roll, and twist the ends like a candy wrapper.
Chill in the refrigerator for 1–2 hours (overnight is even better) until the butter is firm enough to slice.
Slice and serve with steak, poultry, potatoes, vegetables, or on baguette/crackers.
Store in an airtight container in the refrigerator for 5–7 days, or freeze for up to 3 months (it's best to portion the slices beforehand).
For perfect slices, freeze the roll for 10–15 minutes – this makes it easy to cut cleanly.