Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   4      tablespoons   virgin olive oil
   4      medium        red onions -- in 1/4" dice
   2      medium        potatoes -- peeled, in 1/4"
                        -- dice
   2      cups          red wine vinegar
     1/2  cup           sugar
     1/2  cup           mint leaves -- whole, plus
  20                    leaves mint
   1      recipe        basic pasta with semolina
   6      tablespoons   butter
   1      cup           pecorino sardo -- freshly grated
                        lots of black pepper

Preparation:

In a 12 to 14-inch sauté‚pan, heat olive oil until smoking. Add onions and potatoes and cook until softened and lightly browned, about 8 to 10 minutes. Add vinegar and sugar and bring to boil. Heat and reduce until almost dry, about 15 minutes. Allow to cool and stir in mint leaves. Roll out pasta to thinnest setting on pasta roller. Cut dough into 3-inch disks and place 1 tablespoon onion mixture in center of half the disks. Use the other half to cover and pinch sides together. Continue until all filling is used up. Bring 6 quarts water to boil and add 2 tablespoons salt. Add culingionis and cook until tender, about 3 to 4 minutes. Meanwhile, melt butter in a 12 to 14-inch sauté‚pan. Drain pasta carefully and place in pan with butter. Add mint leaves and half the cheese and toss. Serve immediately. Yield: 4 servings