Coarsly dice the bacon slices. Set aside.
Peel and finely slice the onions.
Preheat a large heavy skillet and saute the bacon until crisp.
Gradually, add all of the sliced onions. Stir well. Cook covered until the onions are translucent and soft but not brown. When finished, let them cool doen slightlyw
To a medium bowl, add the eggs, sour cream, mustard, flour, caraway seeds, salt, and some fresh ground pepper. Mix well until combined.
Add the onions to this egg-sour cream mixture.
Press the crust or pizza dough into a lightly greased, rectangular baking dish.
Preheat the oven to 375˚F.
Pour the onion mixture over the crust and spread out evenly.
Bake at 375˚F for 40-55 mins or until set and golden-brown.
Serve warm.
