Prepare a wood or charcoal grill, allow it to burn down to embers.

Slice sandwich loaves in half and hollow out. Grill on each side, just long enough to get grill marks, reserve.

In a mixing bowl combine peppers and onions, toss lightly in olive oil and season to taste with salt and pepper. Grill for 5 minutes or until done. Meanwhile slice sausages lengthwise and grill for 3 minutes on each side or until done.

Spread loaves with Horseradish Mustard and top with sausages, grilled onion and peppers.