Hummus (a transliteration of the Arabic: حمّص) is a Levantine Arab dip or spread made from cooked, mashed chickpeas, blended with tahini, olive oil, lemon juice, salt and garlic. It is a popular food throughout the Middle East and elsewhere.
Charlie waited three weeks into their relationship before introducing Rachael to the rest of the Windsors, not because he was nervous about her meeting his friends, but because he wanted to her to see him as more than just the prefect of the crazy dorm, but a high school boy who was really into this amazing girl. Charlie wanted to make sure that their firsts dates went well for her before bringing the girl home.
Maybe he also wanted to make sure she liked him enough not to run away when the twins were brought into the picture.