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Chocolate Log Cake (Ulog) with Chocolate Buttercream and Meringue Mushrooms

Recipe by Claire Saffitz x Dessert Person

A festive holiday chocolate log cake (Ulog) inspired by European pâtisseries. A light chocolate Swiss‑roll sponge is filled with a silky chocolate‑creme fraîche filling, coated in rich chocolate buttercream, and decorated with delicate meringue mushrooms. Perfect for a show‑stopping dessert.

MediumFrenchServes 12

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Source Video
3h 41m
Prep
1h 24m
Cook
37m
Cleanup
5h 42m
Total

Cost Breakdown

$11.91
Total cost
$0.99
Per serving

Critical Success Points

  • Folding the whipped egg whites into the chocolate batter without deflating.
  • Rolling the hot sponge onto a cocoa‑dusted towel to prevent cracks.
  • Chilling the chocolate filling until firm before spreading.
  • Achieving the correct sugar‑syrup temperature (238°F) for the buttercream.
  • Baking the meringue mushrooms at low temperature to dry them completely.

Safety Warnings

  • Handle hot sugar syrup with care; it can cause severe burns.
  • Use oven mitts when removing hot pans.
  • Be cautious when working with melted chocolate – it is hot and can cause burns.

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