|Canned tuna||13 Ounce|
|Chopped celery||1 Cup (16 tbs)|
|Chopped onion||1⁄2 Cup (8 tbs)|
|Whole wheat bread slice||2|
|Mayonnaise||1⁄4 Cup (4 tbs)|
|Prepared horseradish||1 Teaspoon|
|Dry mustard||1⁄2 Teaspoon|
Place tuna in a colander, and rinse under cold rap water 1 minute; set colander aside to let tuna drain 1 minute.
Coat a large skillet with cooking spray; add margarine, and place over medium heat until margarine melts.
Add celery and onion, saute until render.
Remove from heat, stir in tuna and 2/3 cup bread cubes.
Add mayonnaise, horseradish, mustard, salt, and pepper, mix well.
Divide mixture evenly into 6 baking shells or 6-ounce custard cups coated with cooking spray.
Sprinkle remaining bread cubes on top.
Bake at 350Â° for 15 minutes.