It's really super easy! You just need chick peas (about 3 1/2 cups), a couple of tablespoons of tahini, and a touch of lemon juice. I've always just done it to taste and made sure the texture is right, so the measurements are approximate.
And, of course, if you want some flavor you can add whatever- roasted red peppers, garlic, etc.
My mom is of middle eastern descent so I grew up eating a lot of hummus : ) we always add lots of garlic, salt, a little olive oil, and to get a less thick consistency, some of the liquid from the can of chick peas and of course tahini. Make sure you use fresh lemon juice (not from a bottle).
I got on a hummus kick at one point. My advice is don't look at that huge bottle of tahini and think "well, I LOVE hummus and I'm going to make a lot of it so I'll buy the more economical large size" you aren't likely to use it as it has a short shelf life once open and in the fridge. Try your local food co-op and purchase just what you need.
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I have adapted my hummus recipe from Racheel Ray's, though I usually just eyeball everything. I don't have a food processor so I use a blender, which works okay...a food processor will get a much smoother consistency.
Hummus
2 c chickpeas, boiled and drained (or 1 can) 2 T tahini olive oil, to taste 1 t paprika 1 t cumin 1 t cayenne 2 cloves garlic course salt ½ lemon juiced water, as needed
Combine chickpeas, tahini, oil, spices, garlic, salt, and lemon juice in food processor/blender and grind into a smooth paste. Add water in very small amounts, as needed. Add more spice, oil, lemon juice, or other ingredients such as pine nuts or roasted red peppers, as desired.