Pre-Sear vs Post-Sear Protocol in Sous-Vide

The pre-sear and post-sear protocols were systematised by Thomas Keller in Under Pressure (2008) and extended in Modernist Cuisine. Both approaches existed in early sous-vide practice; Modernist Cuisine was the first to analyse them as distinct techniques with different flavour outcomes.

The order of searing relative to the sous-vide bath is a genuine technical choice with distinct outcomes, not a matter of preference. Pre-sear — searing before the bath — develops Maillard compounds on the exterior that are then sealed into the bag along with the protein. Over a long bath (24–72 hours), these compounds partially migrate into the bag liquid, creating a more complex sauce base. The pre-sear also helps set the surface of the protein, which can be useful for irregular cuts that would be difficult to sear evenly post-bath. The limitation: after 72 hours in a bag, the seared crust rehydrates and softens. The final product must still receive a second sear post-bath to rebuild it, making the pre-sear a flavour investment, not a crust investment. Post-sear — searing after the bath — is the standard protocol for most applications. The protein emerges from the bath fully cooked to the correct internal temperature. A fast, hot sear on a cast-iron surface or plancha builds the Maillard crust without affecting the interior. The constraint: the exterior must be completely dry before searing, or surface moisture generates steam that inhibits browning. This is the most controllable protocol for service because the sear is the last step and can be calibrated per portion. Dual-sear — sear before the bath and again after — is used for maximum flavour in long cooks. Both Maillard development in the bag liquid and a fresh crust for service. The technique doubles the searing time and fat usage but produces the most flavour complexity from the preparation.

Maillard compounds formed during pre-sear are fat-soluble and partially migrate into the bag fat fraction over long cook times, enriching the bag liquid. Post-sear creates a fresh, intense Maillard crust for the diner's first impression. The flavour profiles are different — pre-sear compounds are integrated into the sauce; post-sear compounds are concentrated on the surface.