What exactly is compound butter?
It is softened butter, whipped with various sweet or savory ingredients. While the concept is simple, the potential flavor combinations are endless. Pair scones, rolls, pancakes, waffles or cornbread with butters flavored with orange or lemon zest, maple syrup, honey or cinnamon. Pair meat, vegetables, fish and bread with butters mixed with herbs, spices, cheese or citrus zest. (The Pioneer Woman)
I make Herbal Butter all the time, especially in the summer when I have fresh herbs in my little garden.