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1
Turn the fromage blanc into a wide bowl. Beat vigorously with a fork or whisk for two to three minutes, working air through the mass until the texture lightens and the surface holds a faint, mousse-like sheen. The cheese is ready to receive the seasonings when it no longer looks dense or grainy.
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2
Whisk the olive oil and white wine vinegar together in a small bowl until briefly emulsified. Set aside.
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3
Fold the finely minced shallot and crushed garlic into the aerated fromage blanc. Work them in with a spatula rather than beating, so as not to collapse what was just built. The mixture should remain light. This is where the dish lives or dies: too much garlic at this stage, or beaten in too forcefully, and the finished cervelle de canut will be aggressive and dense rather than gently pungent and fluffy — restraint and a folding hand are the whole technique.
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4
Pour the oil-and-vinegar emulsion over the cheese in a thin stream, folding continuously. The mixture should remain cohesive and light, with a faint gloss. No puddles of liquid should remain visible at the base of the bowl.
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5
Add the chives, chervil, and tarragon in equal proportion. Fold through until the herbs are evenly distributed and the preparation is uniformly green-flecked. If using crème fraîche, fold it in now. Season firmly with fine salt and white pepper, tasting as you go — the mixture should be tangy, herbaceous, and gently pungent, with the vinegar clearly present.
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6
Cover the bowl and refrigerate for a minimum of two hours. The rest allows the flavours to meld and the shallot's rawness to mellow. On removal, the cervelle de canut should smell fresh, green, and lightly acidic — not raw or sharp with allium.
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7
Serve scooped into a ceramic bowl — or quenelled with two large spoons into three portions on a plate — with a drizzle of olive oil and a crack of white pepper. Present with crusty bread. The texture at table should be fluffy and mousse-like; if it has tightened in the cold, fold it once or twice to restore the aeration.