Pour pomegranate juice into a bowl.
Add mustard paste, oregano, jeera powder, salt & pepper and whisk it well. Then add olive oil.
In another bowl, put the watermelon cubes, yellow bell peppers, onions, cucumber, tomatoes and olives.
Add parsley, salt and pepper. Mix them all well. Add lettuce leaves, pumpkin seeds and pistachios. Add to the watermelon mixture. Toss it well.
Serve chilled.