To prepare a beef with assorted vegetables, szechuan beans and grains recipe, you'll first need to prepare the vegetables. Cut the beef into bite-sized pieces and add them to the pot. Add the green onions, carrots, and celery and cook until tender, about 5 minutes. Stir in the bok choy and stir-fry for 1 to 2 minutes, or until softened. Season with salt and pepper to taste.