Combine flour, egg, and salt in a bowl. Mix together until it forms a ball. If the dough is too dry, add water 1 tablespoon at a time.
On a lightly floured surface, roll out the dough to a couple millimeters thick. Rub the top with a light layer of flour.
Let rest for 3-4 hours. Every hour, flip the dough over and rub flour on the the top side.
After it's rested for 3-4 hours, use a pizza cutter or sharp knife to cut the dough into thin (1/4 inch) strips. Let stand for 30 minutes.
Bring 2 1/2 cups water to boil. Dissolve 3 tbsps beef bouillon (I use Better than Bouillon). Whisk together 1 tbsp cornstarch with 1 tbsp milk. Add the noodles and cook for 15 minutes.
Let stand 10 minutes before serving.