Shape sausage into six inch oblong patties.
Brown sausage on both sides.
Add water to skillet and cover. Cook thoroughly.
Remove sausage and sauce from pan. Set aside.
Slice French bread leaving a hinge on one side.
Place bread in skillet, cover and steam 2 minutes.
Brush bread with reserved sauce
Spread bread with mayonnaise.
Layer tomatoes, sausage and shredded lettuce.