I think you left out some instructions on the ingredients

[paigemom]

This is from a newsletter  published by the "secondary" dog trainers in town (i.e. not the kennel club established in 1923). It's an ingredient list for doggy brownies apparently they missed the memo that onions are poisonous to dogs.

1lb liver

1 packet Lipton's soup _ any flavor

(THE DRY SOUP MIXES _ beefy

onion, onion, onion mushroom)

2 eggs

3 cups

Comments

[papilio_luna]

Onions in large quantities are not so great for dogs, but plenty of dog biscuit recipes and even the ones sold in stores have a little onion in them. I've used a little onion powder in making dog biscuits.

[hedgemom]

Cooked onions and garlic do not have the dangers that raw onions and garlic have.

And onions are not poisonous; they can cause hemolytic anemia in large quantities.

[blasphemusfish]

The amount of onion in the soup mixes, and the treatment (cooking/drying/rehydrating etc) it's gone through would be nothing to worry about.