Beef Wellington: Moisture Control as the Whole Problem

Mushrooms are 80–90% water. The 25–30 minute cook removes about 90% of it; dry-sauté first, add fat after. Cream added near the end sounds like it should make things wetter and does the opposite — the fat emulsifies the residual water and stops it migrating into the pastry.

Treating the tenderloin as eight flat faces plus two ends gives even caramelisation while keeping the interior raw. A cylinder seared with single flips browns unevenly and drives heat further into the centre, which is then overcooked by the bake.

Prosciutto works by fat solidifying during the chill into a semi-impermeable layer. A crêpe works by its egg protein structure absorbing a little moisture without collapsing. They are not interchangeable, and using both is not redundant.

Start at 220 °C so the butter layers in the pastry expand and set structure before the beef heats, then drop to 190 °C for even penetration. Pull at 52–54 °C: carryover adds about 3 °C during the rest, landing at 54–57 °C for medium-rare.