Conejo con Cebolla (rabbit with onion)

I've had something by this same name in a tapas restaurant and this is my effort to copy it. I'm really really close tastewise. I think it may be wine, rather than beer, but I tried this before I found bottles of wine on sale for ten cents (I bought several dollars worth...looked like a whino, but I use it for cooking. Not drinking.) Meanwhile, we seem to always have beer, despite never actually buying any. And since neither my husband nor myself are beer drinkers...I use it to cook!

1 rabbit
1 large sweet onion, diced
3 cloves garlic, minced
1 beer
1 6oz can tomato paste
3 tbsp olive oil
salt and pepper to taste

Put crockpot on high with olive oil. When ready to be sizzling, add garlic and onion. When translucent, add beer and tomato paste. When boiling, add rabbit. after a few min, turn to low. Cook till meat is falling off the bone.