Corned Beef with tomatoes

2 tablespoons butter 1 medium yellow onion , coarsely chopped 1 tablespoon sofrito sauce 1/2 cup tomato sauce 1 (9 ounce) package frozen French-cut green[...]

12 ounces corned beef (can) 2 ounces butter 1 onion , peeled and chopped 1 1/2 lbs potatoes , peeled and diced 1/2 pint milk 2 tablespoons chutney (sweet) 2[...]