Vegetable Fried Rice Frittata

Name: Vegetable Fried Rice Frittata
Ingredients: 2 cups frozen white rice; 3 tablespoons plus 1 teaspoon vegetable oil; 1 red bell pepper, chopped; 6 ounces baby bok choy, trimmed and roughly chopped; Kosher salt and freshly ground pepper; 2 tablespoons minced peeled fresh ginger; 6 scallions, thinly sliced; 2 tablespoons plus 1 teaspoon low-sodium soy sauce; 8 large eggs; 2 cups bean sprouts; 1 English cucumber, halved lengthwise and thinly sliced; 1 1/2 teaspoons sugar; Sriracha, for serving