Saute the onions and leek in the oil until transparent
Add the meat, sprinkle with salt and pepper, and cook until done, breaking up lumps
Add the cumin and the chopped egg whites and mix well
Cut each spring roll skin into 3 strips of equal width
Lay out 3 to 4 strips on your work surface.
Place a rounded tsp. of the meat mixture toward the bottom right hand corner of each strip
Fold that corner diagonally over to the top left-hand corner, forming a triangle. As you fold, be certain that the side of the strip lines up perfectly with the folded portion
Continue as if folding a flag, alternately folding the bottom corners in a diagonal pattern. Seal the final flap with a bit of the flour paste.
