Insalata di Rinforzo

Name: Insalata di Rinforzo
Ingredients: 4 tablespoons coarse salt (recommended: Maldon); 1 head cauliflower, cut into florets; 2 3/4 cups white wine vinegar; 1 teaspoon fennel seeds; 4 cloves garlic, peeled and left whole; 3 stalks celery, cut on a diagonal into 3/4-inch pieces; 10 ounces pickling onions, peeled after soaking in hot water; 2 yellow peppers, seeded and cut into 3/4-inch thick strips; 2 red peppers, seeded and cut into 3/4-inch thick strips; 1 fennel bulb, sliced; 6 red chile peppers, left whole; 7 ounces pitted olives (black, green, or a mixture); 2 tablespoons capers; 1 bunch flat-leaf parsley, chopped; 3 tablespoons white wine vinegar; 1/3 cup extra-virgin olive oil; Salt and pepper; 1 bottle white wine vinegar; 1 bottle olive oil (not extra-virgin)