Heat the oven to 160 degrees Celcius.
Wash the rhubarb and cut the bottom of. Cut them into small pieces and place them in a dish.
Beat the egg whites to a firm and fluffy mass. Add sugar, salt and whisk again it's a nice coherent meringue, then add the vinegar and whisk again and finally put the mass on top of the rhubarbs.
Bake the dish in a preheated oven at 160 degrees for 15 minutes until the meringue is golden on top and serve while hot.
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