I tasted these at a BBQ and after quizzing the maker, I came up with these. They are called mouses because they sort of look like computer mouses (which are not called mice even if you own more than one :-)!) They apparently freeze well in layers separated by cling film. I found the Ajvar at my local supermarket and after googling it, it seems fairly easily obtainable. It’s a pureed condiment made in Europe from a mix of bell peppers, eggplant and tomato. There is one recipe on ‘zaar for it if you’d like to make your own but it doesn't contain tomato like the comercial one I bought.