Sweet and sour salad

For 4 people: 2 artichokes-2 fennel-lemon juice-1/2 small cauliflower-Green-1 1/2 celery heart Thistle-1/2 onion-2 Tablespoons extra virgin olive oil-1 tablespoon sugar-1/2 cup of vinegar-1 tbsp tomato puree-25 g capers-25 g black olives-20 g raisins- 1 lemon-orange-1 salt

Trim the artichokes, cut them into 4 and then into thin slices, passing them in water with lemon juice.
Clean the fennel and cut into thin slices.
Eliminate all the wires of the Thistle and cut it into pieces that you will put in water and lemon juice.
Separate the cauliflower florets and cut into slices celery.
Boil in salted water and boiling the Thistle for 30 minutes, the florets for 10 minutes, the artichoke to cauliflower 8 minutes, fennel and celery for 5 minutes.
Drain and let cool.
Brown the chopped onion fine in oil, add 2 cuicchiai of water and cook for about 10 mins on low heat.
Add the sugar and cook for 10 minutes, until the sugar is golden.
Add the vinegar and tomato and cook for 3/4 minutes, then add capers, olives and raisins.
Cook and turn off, wash and dry the Orange and lemon, slice thin and place the slices in order to cover the dish.
Diponetevi over the vegetables.
Watered with vinegar dressing, let cool and serve.