FOR THE SAUCE
Prepare the sauce: in a large boule, pour the vegetable broth, soy sauce, sugar and sake. Stir well to dissolve the sugar and mix. Wash and clean the celery ribs, carrots and leeks and cut them lengthwise. Cut the bamboo slices in the same way as the other vegetables. In a large frying pan, heat a finger of extra-virgin olive oil and cook, over high heat, the vegetables you have just prepared for 3-4 minutes and flip them often.
As soon as they are ready, add the sauce and cook for 7-8 minutes more. Meanwhile, in a pot with plenty of salted water, cook the rice noodles for 2 minutes. Drain the noodles and add them to the pan with sauce and vegetables. Then, add the beef tenderloins as well. Complete cooking for another 3 to 4 minutes. Meanwhile, take four small bowls and lightly beat an egg in each. Bring to the table, traditionally in the cooking pan, and each bite will dip into the beaten egg.
Source: https://www.buonissimo.it/lericette/348_Sukiyaki
