Beef and Broccoli Stir-fry

Quick, easy, and yummy. I sliced up:

1 large onion
1 package of button mushrooms
1 head of broccoli

I tossed it in a ripping-hot pan with some canola oil in it, and stir-fried it until the onions and broccoli had softened a bit. I dumped the veggies into a bowl, then tossed into the pan:

1 lb of "stir-fry beef" (which basically amounted to chopped up eye of round, as far as I could tell)
3 cloves of chopped garlic
several splashes of soy sauce

I let the meat cook about 2 minutes, then put the veggies back into the pan with the meat and stir-fried a couple more minutes until the meat was done.