Finely slice the red onion with a mandoline and pour the vinegar over it. Push everything down well and let it marinate.
Heat a grill pan and grill the roast on both sides until nicely colored.
Char the pepper on both sides with a torch on a heatproof plate. Then put all the ingredients for the wild garlic butter in a food processor and blend until smooth. Taste and season with pepper and salt.
Cut the baguette open. Melt some clarified butter in a low cast-iron pan and toast the inside of the baguette.
Assembling the sandwich: Spread the wild garlic butter on both sides of the baguette. Top the bottom half with the roasted roast. Place the cheese slices on top and char them with the torch until the cheese melts nicely. Add the pickled onion and finely chopped lettuce. Close the sandwich with the top half of the baguette.
Wrap the sandwich in butter paper and eat immediately or take it with you for a picnic.
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