There's some variation in hummus, but really not a ton. In most cases, it's mostly just pureed chickpeas with varying amounts of tahini (ground sesame seeds), oil, lemon juice, and garlic. Unless what you ordered in the restaurant was something with a major added ingredient (adding extra garlic, olives, pine nuts, etc), I'd think it might just be the amount of oil as the biggest differential. The store-bought brands are fairly oily, but restaurants often make it downright viscous with olive and/or sesame oil.
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