Thoroughly rinse produce and pat dry. Stem, core, and slice red bell pepper into thin strips. Trim and halve green onions, separating white parts from green parts. Cut white parts into 1" pieces, and thinly slice green part on an angle. Rinse pork chops, pat dry, and cut into 1" cubes. In a small mixing bowl, whisk together hoisin, soy sauce, rice vinegar, sugar, half of the cornstarch and ½ cup of cold water.