Zha Jiang Noodles

Name: Zha Jiang Noodles
Ingredients: 2 tablespoons canola oil; 8 ounces ground pork; 1 medium onion, diced; 1 ½ tablespoons minced fresh garlic; 2 tablespoons black bean paste (see Tip); ¼ cup Shaoxing rice wine (see Tip); 2 tablespoons reduced-sodium soy sauce; 1 ½ tablespoons dark soy sauce (see Tip); 1 teaspoon ground white pepper; 6 ounces five-spice pressed tofu (see Tip), diced; 2 ¼ cups water, divided; 3 tablespoons cornstarch; 28 ounces fresh Shanghai-style or fresh Japanese udon noodles (see Tip); 2 cups julienned mini cucumbers; ½ cup sliced scallions