Pâte à savarin is a moderately enriched yeast batter — softer and wetter than brioche — engineered to absorb a hot sugar syrup (sirop de trempage) after baking, yielding the rum-soaked baba au rhum and the ring-shaped savarin. The formulation: 250g T45 flour, 5g fine salt, 20g caster sugar, 8g fresh compressed yeast (Saccharomyces cerevisiae, or 3g instant), 4 whole eggs (200g), and 125g unsalted butter at pommade (20°C). The reduced butter content versus brioche (50% of flour weight versus 60%) and the absence of milk create a more open, porous crumb with greater capillary capacity for syrup absorption. Combine flour, salt, sugar, yeast, and eggs in a stand mixer with the paddle (not dough hook — the batter is too soft for hook engagement). Beat at medium-high speed for 8-10 minutes until elastic, glossy, and pulling from the bowl in long ribbons. Add pommade butter in two additions, beating until fully emulsified. For baba, pipe into individual dariole molds (buttered and floured) to one-third full. For savarin, fill a buttered ring mold (moule à savarin) to one-third. Proof at 27°C with 75% humidity until the batter rises to the mold rim — approximately 45-60 minutes. Bake at 180°C (350°F) for 18-22 minutes (individual babas) or 25-30 minutes (savarin ring) until deeply golden and a skewer exits clean. The baked crumb must be thoroughly dry — under-baked savarin disintegrates during soaking. Prepare the soaking syrup: 1 liter water, 500g sugar, brought to boil, cooled to 60°C, then add 100-150ml dark rum (Rhum agricole from Martinique, AOC). Submerge the baked, still-warm babas in the 60°C syrup for 3-5 minutes, turning once, until they absorb approximately twice their dry weight. A properly soaked baba should be uniformly saturated when gently squeezed but maintain structural integrity. Glaze with apricot nappage (strained apricot jam thinned with syrup) and finish with Chantilly cream. The savarin ring is traditionally filled with macerated fruits.
Use paddle attachment, not dough hook — the batter is too soft for hook engagement and requires vigorous beating. Fill molds only one-third full; the open-crumb batter will triple during proofing. Bake until deeply golden and thoroughly dry — under-baked babas disintegrate during soaking. Soak in 60°C syrup (not boiling, not cold) for 3-5 minutes to achieve uniform absorption without structural collapse. The baba should absorb approximately twice its dry weight in syrup — squeeze gently to test saturation.
Add rum to the syrup only after it cools below 60°C — the volatile esters that define rum's aroma evaporate rapidly above this temperature. Use Rhum agricole AOC Martinique for authentic French pâtisserie tradition; its grassy, vegetal notes complement the apricot nappage better than molasses-based rums. For individual babas, bake 24 hours in advance and store uncovered at room temperature — the staling actually improves syrup absorption by retrograding the starch, opening the crumb. Brush the soaked and drained baba with a second coat of rum-laced nappage immediately before service for an aromatic burst — the dual application layers flavor on both interior and surface.
Over-enriching with butter to brioche levels, closing the crumb structure and preventing syrup penetration. Using the dough hook, which cannot properly develop the wet, batter-like consistency — the paddle achieves the required elasticity. Under-baking for fear of over-browning, producing a crumb that collapses into mush when soaked. Soaking in cold syrup, which penetrates too slowly and leaves a dry center, or boiling syrup, which destroys the crust. Adding rum to the syrup before cooling below 70°C, which flashes off the volatile aromatic alcohols.
Lenôtre — Faites Votre Pâtisserie Comme Lenôtre; Bilheux & Escoffier — Professional French Pastry Series; Darenne & Duval — Traité de Pâtisserie Moderne