Beat butter with electric mixer until smooth. Add lemon zest and OLD BAY Seasoning, mix until well combined. Wrap compound butter in baking paper or plastic wrap and shape into a log. Keep refrigerated until needed. Slice 1-inch discs as needed to equate to about 1 tablespoon of butter.
Heat grill on medium-high heat. Rub corn with oil, giving them a light coating. Once grill is hot, place corn directly on the grill. Cook for 10-15 minutes, rotating every few minutes until corn is cooked and has some char marks.
Once corn is ready, brush with OLD BAY Butter. Top with spring onion and an extra sprinkle of OLD BAY Seasoning before serving, if desired.