To prepare steak, combine first 6 ingredients in a large zip-top plastic bag; seal. Marinate in refrigerator 24 hours, turning occasionally.
Remove steak from bag, and discard marinade. Heat a grill pan over medium-high heat. Coat pan with cooking spray. Add steak to pan; grill 6 minutes on each side or until desired degree of doneness. Remove steak from pan; let stand 10 minutes. Cut steak diagonally across grain into thin slices; cut slices into 2-inch pieces.
Combine mayonnaise, wasabi paste, and vinegar, stirring well. Spoon 3/4 teaspoon mayonnaise mixture onto each cracker. Divide steak evenly among crackers; top each with 1/4 teaspoon mayonnaise mixture. Garnish with chives, if desired.
Such a simple recipe for something with such a fancy presentation. Loved that you could make pretty much everything ahead of time and just assemble before serving. Marinated the steak Thursday night, sliced it Friday night, made the mayo and assembled Saturday!
Made these to serve with an informal soup supper (with potato leek and carrot-ginger soups). Did not have rice crackers, so sprayed won-ton wrappers with cooking spray and crisped them up in the oven - worked great as a substitute! The marinade had a terrific balance of flavors, and my guests loved the wasabi mayo! Love that you can do so much in advance, including crisping the won-ton wrappers.
Excellent dish and obviously easy to make--I added garlic to the marinade and used buffalo flank steak and it was very tender, otherwise followed the recipe. Served at book club pot luck and it was a big hit. The marinade is very flavorful and I'll use it again either as an appetizer or on flank steak as a main course.
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