Step 1
Heat the oven to 450 degrees. Coarsely chop the garlic, then add the dried oregano and 2 teaspoons salt on top of the garlic and chop together until it forms a paste. Transfer to a bowl, then stir in the vinegar and olive oil.
Step 2
Pour half the dressing into a large bowl, then add the chickpeas, salami, red onion, radicchio, tomatoes and pepperoncini. Mix gently to coat in the dressing, trying not to break up the radicchio and red onions, then spread evenly on a baking sheet. Roast, tossing halfway through, until the red onions and chickpeas are golden, 15 to 20 minutes.
Step 3
Season the ricotta with salt and pepper. Serve the roasted mixture with crusty bread, with a dollop of ricotta and extra vinaigrette, or assemble into sandwiches.