Mix dried onion with water in a small bowl and let stand for five min.
Combine ground beef, flour, chili powder, paprika, and salt.
Add onions and water. Mix again.
In a skillet, cook beef mixture until browned.
Stir often while cooking so no large chunks form; it should be more like a paste. Remove from heat and keep warm.
In a deep- fryer (or you can use a skillet) deep fry the bread for 30 seconds. Let drain on paper towels.
Build Chalupas starting with the meat, sour cream, lettuce, cheese , and tomatoes. Top with hot sauce or salsa if desired.