Preparation

This recipe is a celebration of controlled decay—all the funk, all at once. Cultured butter (butter made from fermented cream) has a tangy, complex flavor that regular butter lacks. Blue cheese contributes veins of mold and sharp, salty intensity. Miso adds fermented soybean depth. The result is a compound butter that's almost overwhelming in its savory complexity.

Spread on warm, charred bread, this is a revelation. It's not for everyone, but for those who love aggressive, funky flavors, this is paradise.

Culturing the Cream (1-2 days before)

1. Combine heavy cream and buttermilk in a clean jar. Stir well.
2. Cover with cheesecloth and leave at room temperature (68-72°F) for 12-24 hours.
3. The cream will thicken and develop a tangy aroma. Taste it—it should be noticeably sour.
4. Refrigerate for a few hours to firm up.

Making the Butter

1. Pour cold cultured cream into a food processor or stand mixer.
2. Process on medium-high speed. The cream will become whipped cream, then suddenly break and separate into butter solids and buttermilk.
3. This takes 5-10 minutes. Once separated, drain off the buttermilk (save it for baking).
4. Transfer butter solids to a bowl of ice water. Knead and squeeze to remove remaining buttermilk. Change water and repeat until water runs clear.
5. Squeeze out excess water. You should have about 1/2 cup of cultured butter.

Making the Compound

1. Let the cultured butter soften to room temperature.
2. Crumble blue cheese and mash with a fork until paste-like.
3. Combine butter, blue cheese, miso, minced shallot, fermented hot sauce, lemon juice, and black pepper.
4. Mix thoroughly with a spatula until fully combined. The mixture should be spreadable but cohesive.
5. Transfer to a ramekin or shape into a log wrapped in parchment paper.
6. Refrigerate for at least 2 hours to firm up and allow flavors to meld.

Serving

1. Slice rustic bread into thick pieces.
2. Grill or toast until charred in spots.
3. While bread is still warm, spread generously with the compound butter.
4. Finish with a pinch of flaky sea salt.
5. Serve immediately. The contrast of hot bread and cold, funky butter is essential.

Storage: This compound butter will keep refrigerated for up to 1 week, or frozen for up to 3 months. The flavors will continue to develop and intensify.