A flavorful spice rub makes pork tenderloin and oven fries a meal that's both healthy and sure to be a hit with the family.
Place mustard seed, fennel, coriander,cumin, and peppercorns in a dry skillet.Place over medium heat, moving skillet tokeep seeds from burning, until aromatic,about 2 minutes. Mustard seeds will beginto pop. Transfer seeds to a spice grinder,cool slightly, and pulse until finely choppedbut not powdery. Transfer mixture to a smallbowl, and stir in the thyme, dry mustard,ginger, 1 teaspoon salt, and sugar. Set aside.
Heat oven to 450 degrees. Position two racks inoven. Spray a small roasting pan and a largecookie sheet with cooking spray; set aside.
Cut potatoes into 1/3-inch-thick sticks. In abowl, toss with oil and 3 tablespoons spicemixture. Spread in a single layer on cookiesheet; bake on bottom rack 15 minutes.
Meanwhile, rub pork with 1 tablespoonDijon mustard. Sprinkle with 1/2 teaspoonsalt and 2 tablespoons spice mixture; patwith hands to make it stick. Lower oven to425 degrees; place pork in prepared pan. Place onupper rack in oven. Cook until fries aregolden and pork is cooked through (145 degrees internally), about 25 minutes. Transfer fries to a bowl and pork to a cutting board;cover both loosely with foil to keep warm.
Place roasting pan on stove over medium-highheat; stir in wine, scraping bottomof pan to release browned bits. Stir in stock;cook, stirring occasionally, until reducedby half, 5 to 7 minutes. Whisk together flourwith 1/4 cup water in a bowl; whisk intosimmering stock mixture. Whisk in remainingtablespoon Dijon mustard; cook untilmixture begins to thicken, 2 to 3 minutesmore. Stir in berries; cook until they beginto soften, about 2 minutes. Season frieswith remaining 1/2 teaspoon salt. Slicepork, and transfer to platter. Serve immediatelywith blackberry-mustard sauceand chopped thyme.