Heat oil
in a large skillet over medium heat. Add all of onions and scallions and toss
to coat with oil. Sauté until onions begin to soften. Cover and cook until
wilted. Remove lid, increase heat and add vinegar. Cook until vinegar is reduced
by half, stirring occasionally. Add sugar and stir well. Reduce heat to low
and continue cooking until liquid is almost absorbed and marmalade is thick,
about 10 minutes. Remove from heat and serve with pork chops. Store any extra
in the refrigerator for up to one week.