This is Food Network's compound butter, and it might be the highest payoff for the least effort in all of cooking. Soften a stick of unsalted butter, fold in finely chopped parsley, thyme, and garlic, roll it into a log, and chill. That's it. A slice melting over a hot steak turns into an instant pan sauce.
The reason to use unsalted butter is control. You add the salt yourself, so you decide whether it's barely seasoned or punchy, light on the herbs or earthy and green. Mince the garlic fine so it spreads evenly, work everything together with a spatula until it's soft but not melted, then roll it tight in parchment so it slices into clean coins.
Once you've made the classic herb version, the variations are wide open. Basil and lime zest, smoked paprika and chives, jalapeno and cilantro, honey and shallot. Melt a coin over grilled chicken, fish, roasted vegetables, or warm bread. Compound butter keeps in the fridge for a week and freezes for months, so make a couple of logs and upgrade dinner whenever you want.