Lab Station 01 Modernist Recipe Book
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February 19, 2026

Gratin Dauphinois

Side Dish 4 phases 2 portions waxy potatoes
Specimen photograph for Gratin Dauphinois

Primary Ingredient Basis: 500 g waxy potatoes = 100%

PHASE A — PREP & SEASON

Components

Ingredient Quantity Scaling
Waxy potatoes 500 g 100.00%
Fine salt 6 g 1.20%
White pepper 0.5 g 0.10%
Garlic (finely grated) 4 g 0.80%
Unsalted butter (for dish) 7.5 g 1.50%

Method

  1. Preheat oven to 170 C (no fan).
  2. Slice potatoes 2–3 mm thick using a mandoline. Do not rinse.
  3. Combine salt, pepper, and garlic.
  4. Butter shallow baking dish thoroughly.

PHASE B — ASSEMBLY

Components

Ingredient Quantity Scaling
Heavy cream (35%) 350 g 70.00%

Method

  1. Warm cream gently to ~40 C (optional but stabilising).
  2. Layer potatoes tightly and evenly.
  3. Pour cream over until just covered.
  4. Tap dish lightly to release trapped air pockets.

PHASE C — BAKE

Components

Ingredient Quantity Scaling
Assembled gratin 1 unit —

Method

  1. Cover loosely with foil.
  2. Bake 45 min (structure set).
  3. Remove foil and bake 30–40 min more.
  4. Target internal temperature 93–96 C.
  5. Top lightly golden; centre fully tender.

PHASE D — SET & SERVE

Components

Ingredient Quantity Scaling
Baked gratin 1 unit —

Method

  1. Rest minimum 30 min before slicing.
  2. Starch network stabilises during rest.
  3. Slice cleanly with sharp knife.
  4. Serve warm, not molten.

Techniques

  • [[Technique - Layered Assembly]]
  • [[Technique - Low Temperature Baking]]
  • [[Technique - Mandoline Slicing]]

Principles

  • [[Principle - Carryover Setting]]
  • [[Principle - Cream Emulsion Stability]]
  • [[Principle - Starch Gelatinisation]]

Ingredients

  • [[Ingredient - Fine Salt]]
  • [[Ingredient - Garlic]]
  • [[Ingredient - Heavy Cream]]
  • [[Ingredient - Unsalted Butter]]
  • [[Ingredient - Waxy Potatoes]]
  • [[Ingredient - White Pepper]]

STRUCTURAL NOTES

  • Potato starch gelatinises at 65–70 C, naturally thickening the cream without flour.
  • Excess heat may cause cream separation — 170 C with no fan maintains gentle, even convection.
  • Traditional dauphinois contains no cheese. This is the hill we die on.
  • Resting is mandatory for structural cohesion and clean slicing; the starch network needs time to set.
  • Do not rinse sliced potatoes — surface starch is the binding agent.

FAILURE MODES

  • Symptom: Cream has split and looks grainy.

  • Likely cause: Oven temperature too high or fan convection creating hot spots.

  • Corrective action: Reduce to 160–170 C, no fan. Ensure foil coverage for initial bake.

  • Symptom: Centre still raw, top already dark.

  • Likely cause: Potato slices too thick or layers too tightly packed restricting cream penetration.

  • Corrective action: Slice 2–3 mm consistently with mandoline. Ensure cream reaches every layer.

  • Symptom: Gratin collapses into mush when sliced.

  • Likely cause: Insufficient resting time — starch network hasn’t set.

  • Corrective action: Rest a full 30 min minimum. Patience isn’t optional here.