Roasted Garlic Hummus

Not the most original recipe, I know (in fact, one of my favorite bloggers, Catherine Newman, is coincidentally also writing about hummus this week). I've tried many variations on it over the years, and of course it never comes out the same. This time, I tried to keep track of what I was doing so that if it came out good, I could replicate it. It came out great, I think! (It could possibly use just a little something else...I was thinking maybe some jalapenos roasted on the grill and chopped up might be a good addition.)

1 can of garbanzo beans (15.5 oz), I used Goya brand this time
juice of half a lemon
1/4 to 1/2 cup of water (start with 1/4 cup)
about half a head (is that right, head? it doesn't sound right...) of roasted garlic (wrapped in tin foil, drizzled with olive oil, and roasted in a 400 degree oven for about 45 mins...which I learned from simplyrecipes.com)
2 tablespoons olive oil
1/2 teaspoon cumin
1/4 teaspoon cayenne pepper
1/4 cup tahini
salt and pepper

Put everything in the Cuisinart except the garbanzo beans and blend it all together. Then add the garbanzos a few at a time. Thin out with more water to the consistency that you like.