Place mustard greens in a large pot of lightly salted boiling water. Cook 6 to 8 minutes or until tender. Drain; rinse with cold running water. Squeeze out excess moisture. Coarsely chop.
In Dutch oven or deep saute pan, heat oil over medium heat until hot. Add shallots, jalapenos, garlic and ginger; cook and stir 1 minute or until fragrant. Add coconut milk, lime juice, fish sauce, brown sugar and hot sauce; bring to a simmer. Add salmon and tomatoes; return to a simmer. Reduce heat to low; cover and simmer 3 minutes. Stir in mustard greens; simmer, covered, an additional 2 to 3 minutes or until salmon just begins to flake. Serve garnished with lime wedges. Enjoy!