My favorite citrus is the yuzu. I discovered this amazingly fragrant fruit while living in Japan years ago, and am happy that I am now able to find it more and more here in the States. Yuzu is a small citrus originally from China but also widely used in Japanese cuisine. Some refer to it as citron but I do not believe it is the same variety. It is smaller and a little less juicy than the average lemon but its fragrance packs a much more powerful punch. You can find it in the fall and winter months in Japanese markets. I love to zest some over fresh tofu with ponzu sauce, grilled fish, sauteed spinach, or simply use as a garnish. Also, typical in Japan this time of year, it is wonderful sliced in half and thrown into your bath for a nice long soak.