Measure cereals, pretzel sticks, pecans, walnuts, and soynuts into a large bowl or food storage bag; gently stir or toss to combine.
In a large, deep skillet, melt margarine with Worcestershire sauce.
Add celery salt, onion salt and garlic salt. Stir mixture to blend, and with low heat still on, add cereals and nuts. With a pancake turner, keep turning until all pieces are coated (very short time). Spread out on 2 large baking sheets (with sides) and place in oven for 1 hour at 250°. Use a spatula to turn ingredients every 15 minutes. Spread out on paper towels to cool. When cool, store in tightly covered container. Reheat to freshen, if necessary.
Published in the October 19, 2005 issue of Farm World.