Whisk lemon juice, red wine vinegar, Dijon mustard, oregano, kosher salt, sugar, and minced garlic.
Stream in extra virgin olive oil and whisk until emulsified. Store dressing in the fridge for up to 2 weeks.
Combine romaine, radicchio, cherry tomatoes, red onion, cucumber, bell pepper, pepperoncini, chickpeas, provolone, and salami in a bowl.
Toss everything together and dress with roughly 1/2 cup of the vinaigrette or to taste.
Toss again, season with salt and pepper to taste.
Transfer to a serving bowl and season with more pepper if desired.
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