Because Mulligatawny soup is a meal on its own, you may want to serve it with flatbread or naan. A spicy cucumber or another salad is also welcome. Rice or another grain can also be added on the side for more of a curry experience. Garnish veggie mulligatawny soup with lemon wedges, chopped coriander, diced red onions, diced chilies, or red pepper flakes.