Saute Beef And Onion In Butter Until Well Browned. Add Paprika And Saute For 5 Minutes. Add Potatoes And Saute For 10 Minutes. Cover With Stock, Add Rice, Peas, Squash And Corn, Simmer For 30 Minutes. Season With Salt And Pepper. And Whisk In The Egg, Forming Threads. Serve With Tortillas.