1. Drain the Prepared Vegetables

Reserve two tablespoons of pepperoncini brine, then drain the peppers, roasted red peppers, olives, and artichokes. Measure the drained ingredients. Let visibly wet items sit in the colander briefly and blot the roasted peppers as needed.

Good draining helps the vinaigrette stay flavorful. The goal is to remove loose packing liquid, not dry the vegetables until they become leathery. Handle artichokes carefully to preserve their shape.

2. Cut into Serving Pieces

Slice the roasted peppers into short strips and quarter the artichokes. Halve oversized olives. Thinly slice the red onion and garlic, then chop the parsley.

Keep the pieces large enough to recognize but small enough to spoon onto a cracker or baguette slice. A mixture of long pepper strips and whole oversized olives can be awkward to serve from a narrow opening.

3. Whisk the Marinade

Combine the olive oil, red wine vinegar, reserved pepperoncini brine, Dijon, Italian seasoning, and black pepper in a small bowl. Whisk until the mixture looks blended. Hold back the salt initially.

The olives, pickled peppers, and artichokes may already supply all the salt the dish needs. You can add a small pinch after the antipasto has chilled and been tossed again.

4. Combine Before Packing

Place the drained vegetables, olives, onion, garlic, parsley, oregano, and crushed red pepper flakes in a large bowl. Pour over about three-quarters of the marinade and fold gently with a large spoon.

Add the remaining marinade as needed for an evenly dressed mixture. Depending on how much liquid the vegetables retain, you may prefer to use all of it or leave a little behind. Refrigerate any unused dressing immediately and use within the same short storage window as the antipasto.

5. Transfer to the Jar

Spoon the mixture into your container, alternating colors if you want attractive layers. Pour in the dressing collected at the bottom of the bowl. Keep the ingredients loosely settled rather than firmly compressed.

Coating is the goal. Complete submersion is unnecessary, and adding extra oil to cover everything would change the dish substantially. Stirring during the refrigerated rest redistributes the dressing over the upper pieces.

6. Refrigerate Promptly

Cover and refrigerate at 40°F or below for at least four hours. An overnight rest is convenient for entertaining. If practical, give the mixture one gentle stir during chilling.

Do not leave it on the counter to encourage flavor development. The garlic and herbs can infuse the dressing while refrigerated. Label the container with the preparation date so the storage window is easy to track.

7. Taste and Finish

Stir gently before tasting. Adjust with a small splash of red wine vinegar for brightness or a little parsley for freshness. Add salt only if needed, and remember that a spoonful eaten with bread may taste more balanced than the antipasto alone.

Cold olive oil can cloud or thicken. Transfer the portion you intend to serve to a bowl and allow it a brief few minutes to loosen, then stir. Keep the main container refrigerated.

8. Serve in Small Portions

Spoon onto a platter or into a shallow bowl with a serving spoon. Provide bread, crackers, or another mild accompaniment. For sandwiches, drain each spoonful slightly so the bread does not become saturated.

Return remaining antipasto to the refrigerator promptly. Refill a small serving bowl from the chilled supply when entertaining instead of setting the entire batch out for the whole event.