Serve with Steamed Artichokes or Asparagus for a delicious spring side dish.
In a medium high-sided skillet, combine shallots and Banyuls vinegar. Bring to a boil over high heat; reduce to a simmer and let cook until shallots are softened and almost all the liquid has evaporated, adding a splash of water, as necessary, to keep shallots from burning. Remove from heat and transfer shallots to a medium bowl; whisk in rice-wine vinegar. Slowly whisk in oil until an emulsion is formed; season with salt and pepper.