Onion tart

I had a lot of onions lying around, so I made a tart which tasted delicious.

5-6 onions, sliced thinly
2-3 tbsp olive oil
1 pizza dough
lots of capers
a few slices of pancetta

Fry the onions in olive oil with a pinch of salt. Start at high heat, then lower it a bit. Keep the lid on the pan. Fry them until they are very soft, for around 30 min.
Spread them on a pizza dough, add capers and cover with pancetta. Add a little pepper.
Bake for 20-30 min at 180°C.