Bring 2 cups of water to a boil in a medium pot, then add the cumin and quinoa. Stir once, reduce heat to low, and cover with a lid. Simmer for 15 minutes until the quinoa absorbs the water and the tiny spirals become visible. Remove from heat and let it sit covered for 10 minutes—this resting period allows the grains to fully fluff and the cumin flavor to develop throughout.
While the quinoa cooks, dice the red bell pepper into small, even pieces, finely dice the red onion, seed and mince the jalapeno, and roughly chop the fresh cilantro. Measure out the corn and set all ingredients aside in separate small bowls. Having everything prepped and ready (mise en place) ensures smooth assembly and prevents the finished salad from sitting too long.
Transfer the cooked quinoa from Step 1 to a large bowl and let it cool for a few minutes. Add the rinsed black beans, black eyed peas, and all the prepared fresh vegetables from Step 2 (bell pepper, onion, corn, cilantro, and jalapeno). Pour in the lime juice, olive oil, salt, and cracked black pepper. Toss everything together gently but thoroughly, making sure the lime dressing coats all the ingredients. I find that letting this sit for 5-10 minutes allows the flavors to meld beautifully before adding the avocado.
Dice the avocado just before serving and gently fold it into the salad from Step 3—this prevents the avocado from breaking down and browning. Arrange endive leaves or sturdy greens on a serving platter and spoon the cowboy caviar salad onto them. Serve with extra lime wedges on the side for guests to add brightness to taste.