This dish can be made with shrimp, chicken or pork instead of tofu. Look for the more exotic items in the Asian foods section at your local grocery store. Adjust the pad Thai sauce ingredients to taste.
The fresh lime juice and mustard add a nice tang to this moist and flaky grilled salmon. I came up with this marinade after tasting something similar at a friend's house and it is now one of our favorite ways to do fish. You may also use other firm fish steaks instead of salmon; halibut, tuna and swordfish all work well.