Soy Mustard Sauce

• Soy-Mustard Sauce:
• 1/4 cup Coleman's mustard powder
• 2 tablespoons hot water
• 2 tablespoons unseasoned rice vinegar
• 1/4 cup soy sauce
• (See recipe for Beurre Blanc below)
• Blackening Spice
• 1 Ahi tuna fillet, about 2 inches thick and 5 inches long (about 8 ounces)
• 11/2 tablespoons paprika
• 1/4 tablespoon cayenne powder
• 1/4 tablespoon pure red chile powder
• 1/2 teaspoon freshly ground white pepper
• 1/2 tablespoon ground sandalwood (optional)
• Garnish
• 2 or 3 tablespoons red pickled ginger
• 1/2 teaspoon black sesame seeds
• 1 ounce Japanese spice sprouts or sunflower sprouts (top 2 inches only)
• 1 tablespoon seeded and diced yellow bell pepper (optional)
• 1 tablespoon cucumber, cut into matchsticks (optional)

1. To prepare the Soy-Mustard Sauce, mix the mustard powder and hot water together to form a paste. Let sit for a few minutes to allow the flavor and heat to develop. Add the vinegar and soy sauce, mix together, and strain through a fine sieve. Chill in the refrigerator.
2. Warm the Beurre Blanc in a double boiler (see below for recipe).
3. For the Tuna:
4. Mix all the blackening spices
5. together on a plate, and dredge the Ahi covering all sides. Heat a lightly oiled cast-iron skillet and sear the Ahi over high heat to the desired doneness (about 15 seconds per side for rare to 1 minute per side for medium-rare). Cut into 16 thin slices.
6. For each serving, arrange 4 slices of the Ahi in a pinwheel or cross shape on the plate. Ladle a little of the Soy-Mustard Sauce in two opposing quadrants between the tuna, and ladle the Beurre Blanc in the other two quadrants. To garnish, put a small mound of the red pickled ginger on the Beurre Blanc on either side, and sprinkle the sesame seeds over the Soy-Mustard Sauce. Arrange the spice sprouts, bell pepper, and cucumber at the very center of this pinwheel.

water, rice vinegar, soy sauce, blackening spice, tuna fillet, paprika, cayenne powder, chile powder, freshly ground white pepper, ground sandalwood, red pickled ginger, black sesame seeds, sprouts, yellow bell pepper, cucumber

Taken from www.epicurious.com/recipes/member/views/soy-mustard-sauce-50104541 (may not work)