1. Sift together flour and salt into mixing bowl. Cut in shortening until mixture resembles coarse meal. Add onions and water, stirring with fork only until combined. Shape into ball. Roll out on lightly floured surface to circle about 25 cm (10") in diameter. Fit loosely into 20 cm (8") pie pan. Fold edges under.
2. Brown meat in heated shortening in large fry pan, stirring frequently. Remove from heat. Stir in ketchup, cheese, egg, mustard, pepper, Worcestershire sauce, green pepper and cereal. Spread in pastry-lined pan.
3. Bake in moderate oven 200°C (400°F) about 20 minutes; remove pie from oven and place tomato slices on top. Return pie to oven and bake 5 minutes longer or until crust is browned. Cut into wedges; serve immediately.
In keeping with good allergy practices, we remind you to be aware of allergens and to check labels on any packaged goods used. This recipe has been tested using Kellogg's* products. Results with other products may vary.