Beef & Broccoli (in a crockpot)

I adapted this recipe from these two here and here (the links show a standard way to make it in a wok, but this is my crockpot version). My biggest complaint about the B&B I've usually gotten is that the beef is tough and chewy. Using a crockpot seemed like the obvious solution for this, and it works beautifully!
The first time I did this I put the broccoli in at the start with the beef and it turned to grey mush. Don't do that! Save it for the end like the directions say. Also, I found that this really only needed to go for about 4-5 hours, but I had put it in too early so ended up putting it on 'warm' for a few hours in the middle of the day to slow the cooking...it worked, but next time I'll just put it in later in the day. So this is not a leave-it-all-day recipe, but it can be put in in the early afternoon. ☺

[my apologies, I forgot to get a photo of this...but it looks awesome I promise!]

Cooktime--about 4-6 hours

Marinade:
1/3 c oyster sauce (don't try to substitute this, it really is the magic ingredient--you can find it in the Asian section of the grocery store)
1 Tbs Asian (toasted) sesame oil
1-2 tsp soy sauce
1/4-1/3 c rice wine vinegar (in the Asian section) OR rice wine OR cooking sherry (the recipes call for the wine/sherry, I didn't have it so I used the rice vinegar and it was fine. You could probably get away with plain white vinegar, but if you cook much Asian you'll want the rice stuff on hand anyway, so just get it!)
1 Tbs cornstarch (or 2 Tbs flour)
2-4 cloves minced garlic (or 1-2Tbs garlic powder)
1 thin slice of ginger root, shredded (or about 1/4 tsp powdered ginger)

3/4-1 lb beef. Ideally steak cut into strips (can be raw or leftover), but you can also use stew meat or pretty much any cut. I don't recommend leftover roast as it will shred rather than staying in nice chunks.
1 smallish onion, cut into strips
1 small head broccoli, cut up (or about 3/4 lb frozen florettes)

Mix up all the ingredients of the marinade. Put beef in the crockpot (I used a 4qt) and pour the sauce over it and stir around until the beef is well coated. Turn on low. After the first couple of hours, check in on it and see if it's getting done. The meat should be all browned though not thoroughly cooked at this point. Stir it around to keep the sauce distributed, and adjust the cooking temperature up to 'high' or down to 'warm' if you think it's going too slow/fast for when you want to serve dinner.
At about 90 min before dinner time, put in the onion and stir it all around.
At about 60 min before dinner time, put in the broccoli (or 40 min for frozen florettes). Stir it all around.

Serve over rice.