Preheat grill. Brush the onions with 1 tablespoon of the olive oil and season with salt and pepper and grill until lightly brown. Remove from the grill and slice thinly. Heat the remaining olive oil in a medium saucepan over medium heat. Add the onions, garlic, and jalapeno and cook for 1 minute. Add the vinegar, cassis, grenadine, red wine and reduce until the liquid has almost evaporated. Remove from heat, add the parsley and salt and pepper to taste. Grill sausages. Serve at room temperature. Each sandwich gets sausage, red pepper and marmalade on a hoagie.