This Thai-style soup is brothy, fragrant, and delicately flavored. While tom kha is typically made with chicken (in which case it’s known as tom kha gai), I like making it with shrimp as a change of pace. This soup reheats very well, and I find the flavors deepen over time. If you plan to serve it a day later, don’t add the shrimp until you’re just about ready to serve the soup. Instead, reheat the soup and add them for the last few minutes of cooking.