Excerpted from Feeding the Fire by Joe Carroll and Nick Fauchald (Artisan Books). Copyright © 2015.
Step 1: In a saucepan, melt the butter over low heat. Add the garlic and cook over medium-low heat for 5 minutes; the butter should simmer gently but not brown. Remove from the heat.
Step 2: Skim the foam from the top of the butter and slowly pour the butter through a fine-mesh sieve set over a bowl. Discard the milky solids and garlic. The butter can be refrigerated for up to 3 weeks.