Prepare your ingredients: Drain and rinse 2 cans of black beans in a fine-mesh colander under cold running water for 1–2 minutes until water runs clear. This removes excess sodium and starch. Pat the colander on the bottom of the sink to remove excess water. Transfer to a large mixing bowl.

Make the vinaigrette: In a small bowl, combine 1/4 cup extra-virgin olive oil, 3 tablespoons red wine vinegar, 2 tablespoons fresh lemon juice (squeeze from half a fresh lemon), 2 minced garlic cloves, 1 teaspoon dried oregano, 1/2 teaspoon ground cumin, 1/2 teaspoon salt, 1/4 teaspoon black pepper, and 1/4 teaspoon red pepper flakes if using. Whisk for 30 seconds until combined. Checkpoint: The vinaigrette should smell fragrant and look slightly emulsified.

Dice all fresh vegetables: Cut 1 red bell pepper into 1/4-inch dice (remove seeds and white ribs first). Cut 1 yellow bell pepper the same way. Finely dice 1/2 of a red onion into thin half-moons. Halve 1 cup cherry tomatoes lengthwise (this prevents excessive liquid from pooling). Dice 1 English cucumber into 1/4-inch cubes. Checkpoint: All vegetables should be roughly the same size for even texture throughout the salad.

Combine vegetables and beans: Add all diced vegetables and peppers to the bowl with black beans. Pour the entire vinaigrette over the mixture and toss gently with a large spoon or salad tongs for 1–2 minutes, making sure the vinaigrette coats everything evenly. Checkpoint: All vegetables should be glistening with dressing and well combined.

Let sit for 10–15 minutes at room temperature: This allows the flavors to meld and the beans to absorb the vinaigrette. You can prepare the salad to this point up to 4 hours ahead; cover and refrigerate if making more than 30 minutes in advance.

Prepare avocado just before serving: Cut 2 ripe avocados in half lengthwise by rotating them around a sharp knife until you reach the pit. Twist the two halves apart. Remove the pit by carefully striking it with the knife blade and twisting it out. Score the flesh in a cross-hatch pattern (1/4-inch cuts) without cutting through the skin, then scoop into cubes with a spoon into a small bowl.

Pit and halve kalamata olives: If using whole olives, carefully pit 1/2 cup by pressing each olive between your thumb and knife blade until the pit pops out, then halve lengthwise. If using pre-pitted olives, simply halve them.

Final assembly: Gently fold the avocado cubes and 1/2 cup halved kalamata olives into the salad using a rubber spatula, being careful not to mash the avocado. Use a gentle folding motion, not stirring. Checkpoint: The avocado pieces should remain intact and visible.

Add fresh herbs and cheese: Sprinkle 1/4 cup chopped fresh cilantro, 1/4 cup chopped fresh parsley, and 1/3 cup crumbled feta cheese over the top. Checkpoint: The salad should look colorful and fresh with visible green herbs and white cheese.

Taste and adjust: Take a bite. Add more salt, pepper, or a squeeze of fresh lemon juice to taste. Remember that feta and olives are salty, so go easy on additional salt at first.

Serve immediately: Divide into serving bowls or plates. The salad is best served at room temperature or lightly chilled within 30 minutes of assembly to keep the avocado from browning. Checkpoint: Each serving should have a good mix of beans, vegetables, avocado, olives, cheese, and herbs.

Troubleshooting:If avocado is browning: Toss the cubed avocado in a little extra lemon juice to slow oxidation, and add it to the salad as close to serving time as possible.

If salad tastes bland: Check the amount of salt you used; beans need more seasoning than you might expect. Add a small pinch of salt at a time and taste.

If vinaigrette is too acidic: Add 1 more tablespoon of olive oil to mellow the sharpness, or use a little less vinegar next time.

If vegetables are too crunchy: Let the salad sit for 15–20 minutes after dressing so vegetables soften slightly and flavors meld.

If salad becomes watery: This usually happens if you let it sit too long after adding avocado. Make sure to add avocado close to serving time, and drain excess liquid from tomatoes before adding them.