The authentic mojo is made with juice from sour oranges. It still has that little orangy taste, but its very acid and tart. You can come close by mixing equal amounts of freshly squeezed orange juice with lime juice (*). If you live in areas with large concentration of Latinos you will probably find bottled Mojo (Goya brand makes one) or their produce department might have the slightly bumpy, thick skinned sour oranges. This recipe makes one cup.