Place the softened butter in a small pot on the stove and warm it over low heat for about a minute. You do not want it to melt completely, just soften enough that it can be easily mashed and whisked into a creamy texture. This helps keep the herbs and garlic evenly distributed instead of sinking to the bottom of the candle. If the butter melts too much, let it cool slightly until it begins to firm back up, then whisk it until creamy.
When the butter is creamy, whisk in the roasted garlic, finely chopped herbs, and a small pinch of salt. Stir until the mixture is smooth, creamy, and evenly combined, making sure the herbs are well distributed throughout the butter.
Cut a small hole in the bottom of an 8-ounce paper cup and thread the food-safe wick through it. Tape the bottom to help hold the wick in place, then lay a pencil or small stick across the top of the cup and wrap or rest the wick against it so it stays centered and upright.
Spoon the butter mixture into the paper cup, pressing it down gently as you go to remove air pockets and keep the wick centered and secure. Once you reach the top, you can remove the pencil and smooth the top of the butter. Just make sure that the wick is standing straight in the center.
Place the paper cup in the refrigerator for about 2 hours, or until the butter candle is firm all the way through.
Remove the tape from the bottom of the cup. Then gently push the butter candle up from the bottom to release it. If it does not come out easily, carefully peel away the paper cup instead. Place the finished butter candle on a small plate, ramekin, or shallow dish. Let it sit at room temperature for a few minutes before serving.
(Optional): If Placing into a boule: Use the bottom of your cup as a guide to cut out the center of a boule, then use a spoon to hollow it out without going all the way through to the bottom.
Cut the bread in a crosshatch pattern so it is easy to pull apart, then place the cold butter candle in the center. Let the butter soften slightly at room temperature before serving so it melts more easily for your guests.
Light the wick just long enough for the top to soften into warm melted butter. Serve right away, and keep a close eye on it while it is lit.