If using beef or another large liver, slice liver into 2” chunks and remove any vessels the butcher might have missed.
Line a 7.5″x3.5″ loaf pan with parchment paper.
Heat ¼ cup of your chosen cooking fat in a large skillet over medium high heat.
Add onion, bay leaf, rosemary, thyme, sage, mace and garlic to the pan. Cook, stirring frequently, until onions are well cooked, about 10 minutes.
Add liver to the pan and cook, stirring frequently, until browned on the outside and still pink in the middle, about 3-4 minutes.
Add sherry to pan and bring to boil. Boil 2-3 minutes until you can’t smell alcohol in the steam. Remove from heat.
Remove bay leaf, rosemary stem, and thyme stems. Add salt and the remaining cooking fat.
Pour hot liver mixture into a blender or food processor. Pulse until smooth.
Pour into the prepared loaf pan or serving dish of choice. Let cool.
Once it’s cool enough to touch, cover with plastic wrap tightly across the entire surface to prevent oxidation.
Refrigerate at least one hour or overnight.