We know there was another song but we never get to see it. Who knows what other food items where sung about or if there was fish finger innuendo? A whole verse about the fish finger innuendo!
But it seems the most memorable verse was the one about the couscous, so who sang the verse about the couscous?
I'm saying Willow, mainly because I like the idea that Tara said it and Willow kept a mental note of it to bring out an embarrassing story at a later date to get back at her. No one will know who the embarrassing story is about but Tara will know. couples petty revenge fun.