*Canned mango puree is available in Asian markets and gourmet stores. Alternatively, puree fresh mango in a blender or food processor.

**Sambal is a spicy seasoning paste available in Asian markets and gourmet stores.

To prepare the prawns: Combine the lemon juice, paprika, and sambal in a medium bowl. Season with salt and pepper. Add the prawns, turning them in the marinade so they are well coated.

Heat 2 tablespoons of olive oil in a large skillet over medium-high heat. Working in batches, add the prawns and cook, turning them once or twice, until they are opaque throughout, 4 to 8 minutes. Allow the prawns to cool, then slice each in 1/2 lengthwise and reserve.

To make the dressing: Scrape the seeds from the vanilla bean into a small bowl. Add the mango puree. Gradually whisk in the grapeseed oil and rice vinegar. Season with salt, pepper, and ginger (alternatively grate the ginger into a clean towel then squeeze the juice into the dressing).

Arrange a 3-inch ring mold in the center of 4 plates. Put 1/4 of the hearts of palm in each of the rings and gently press down. Cover each layer of palm with 3 to 4 tablespoons of diced mango, then top with 5 prawn-halves, cut side down. Combine the arugula and baby greens in a medium bowl. Add dressing, salt and pepper and mix well.

Carefully lift the ring molds off the salads. Top each salad with greens. Drizzle dressing around the plates, garnish with edamame beans, diced tomato, and fried shrimp heads (if using) and serve.