Finely chop the red onion with a mandolin and pour the vinegar over it. Push everything well and let it move in.
Heat a grill pan and grill the roast on both sides until it is beautifully colored.
Burn the pepper on both sides with a burner on a refractory plate. Then put all the ingredients for the mug butter in a food processor and mix until smooth. Taste and season with salt and pepper.
Cut the baguette open. Melt some clarified butter in a low cast iron pan and toast the inside of the baguette.
Compiling the sandwich: spread the tanglook butter on both sides of the baguette. Cover the lower half with the roasted roast. Put the cheese in slices and scoop them with the burner until the cheese melts nicely. Add the imposed onion and finely chopped lettuce. Close the sandwich with the top of the baguette.
Wrap the sandwich in butter paper and eat immediately or take with you for a picnic.
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