In a large mixing bowl, combine the black-eyed peas, black beans, corn, tomatoes, bell pepper, onion, cilantro, and jalapeño. If you plan to include avocado, keep it aside and dice it just before serving to maintain its freshness and color.
In a small bowl or measuring cup, whisk together the olive oil, red wine vinegar (or lime juice), garlic, salt, oregano, basil, maple syrup (or honey), red pepper flakes, and black pepper until well emulsified. Drizzle this dressing over the vegetable mixture.
Gently toss everything together until the ingredients are thoroughly coated with the dressing. Taste the salad and adjust with extra salt or pepper if needed. For a tangier kick, add another tablespoon of vinegar, or for a richer taste, incorporate an additional tablespoon or two of olive oil.
For the best results, allow the flavors to meld by letting the salad sit and marinate for at least 20 minutes before serving. If adding avocado, fold it in just before serving for a fresh and creamy touch.