Borscht is a soup of Ukrainian origin that is popular in many Eastern and Central European cuisines, including those of Poland, Russia, Ukraine and Belarus. In most of these countries, it is made with beetroot as the main ingredient. In some countries, tomato is used as the main ingredient, while beetroot acts as a secondary ingredient. Other, non-beet varieties also exist, such as the tomato paste-based orange borscht and green borscht (sorrel soup). Potatoes and cabbage are also standard; some regions have green borscht, where green spinach is substituted for the cabbage.