Make Lime Dressing: Place all ingredients and a pinch of ground black pepper in a screw-top jar. Secure lid. Shake until salt dissolves and mixture is combined.
Place prawns, garlic, lime rind and oil in a glass or ceramic bowl. Toss gently to coat. Cover. Refrigerate for 10 minutes.
Meanwhile, place 5 tablespoons dressing in a food processor. Add spinach. Process to a puree, adding 1 tablespoon water to mixture if needed. Transfer to a large bowl. Add rice. Toss to combine. Top with tomato.
Heat a large non-stick frying pan over high heat. Cook prawns, in 2 batches, for 1 minute each side or until just cooked through and starting to brown (see Notes). Transfer to a plate.
Drizzle prawns with remaining dressing. Scatter with coriander leaves. Serve with green rice and lime wedges.
