You might be wondering, why add salsa to your butter? But after trying this recipe, you might be wondering why wouldn’t you add salsa to your butter? Mixed in alongside the salsa are fresh cilantro, lime zest and juice, plus cumin and garlic. Adding a pat of this flavorful compound butter can do a lot: melt it onto mashed potatoes, slide it between the folds of a freshly baked biscuit, or slather it onto toast and top with a fried egg. The possibilities are endless.