A banh mi is basically a Vietnamese hero sandwich. Often made with ground pork, this one has pork tenderloin that can be grilled or pan seared. The pate is optional, but normally found in a banh mi. Recipe adapted from Yahoo! Shine.
Slice carrots and radishes in fourths or sixths lengthwise, depending on size (you are making a sort of slaw).
Combine with remaining ingredients; set aside for flavors to meld an hour or up to overnight (will keep for several days, refrigerated).
Slice tenderloin, against the grain, into 1/2 inch slices; pound to an even 1/4 inch thickness between plastic wrap.
Make a marinade by combining fish sauce, maple syrup, brown sugar, soy sauce, sesame oil, minced garlic, minced ginger, green onion, and black pepper; make sure all the pork is coated in the marinade and let sit for 10 to 30 minutes.
Heat your grill, grill pan, or cast iron skillet to high; add vegetable oil to marinated pork and stir to coat.
Sear pork 1 to 2 minutes per side (it cooks very quickly).
To assemble sandwiches, slice the baguette and spread with mayonnaise on one side and pate (or liverwurst) on the other (if using); add lettuce, meat, pickled vegetables, sliced jalapeno, and cilantro.