Cucumber and citrus are very similar: vitamin C in citrus will be destroyed by decomposing enzymes in cucumber. Cucumber and pepper are very similar: the vitamin C in pepper will be destroyed by the decomposing enzymes in cucumber. Cucumber and cauliflower are very similar: the vitamin C in cauliflower will be destroyed by the decomposing enzymes in cucumber. Cucumber and spinach are very similar: vitamin C in spinach will be destroyed by decomposing enzymes in cucumber.