Thinly slice the baby red onions and place them in a medium bowl. Add the ground black lime, red wine vinegar, and salt. Massage the mixture gently for about 2 minutes until the onions soften and become fragrant. Let them sit for 20 minutes to macerate.

In a separate mixing bowl, whisk together the olive oil, pomegranate molasses, additional red wine vinegar, ground black lime, and a pinch of salt until well combined. Set it aside.

Wash and dry your mixed tomatoes thoroughly. Slice larger tomatoes into thick rounds and halve the smaller varieties. Combine halved small tomatoes with torn basil leaves and half of the pomegranate arils in a mixing bowl. Drizzle some of the dressing over this mixture and toss gently to coat.

On a large serving platter, artistically arrange the sliced larger tomatoes around the edges. Spoon the small tomato mixture into the center, and scatter the marinated black lime onions over the top followed by the remaining pomegranate arils and basil leaves.

Serve the Tomato Pomegranate Salad with Black Lime Onions immediately for maximum freshness.