You know you've fallen for a place when you can't wait to go back there. I feel that way about Aigre Doux (AHG-ra DO), which is one of the most under-hyped restaurants in the city. Husband-and-wife team Mohammad Islam and Malika Ameen have crafted an understated, inviting space right across from the Merchandise Mart that focuses on turning out spectacular food. Every course I had of my meal there was both surpring and stellar, which included a coconut crusted whitefish that balanced the delicate Asian earthiness of shiitake mushrooms with green mango. It's a truly excellent little place.