In a pitcher, mix together the tomato, orange & lime juice with the grenadine, Worcestershire sauce, Tabasco, ½ tsp salt & pepper. Set aside & chill in the fridge for 30 min.
Cut the cucumber in half & scoop out the seeds with a small spoon. Finely dice the flesh into 4-5mm cubes. Dice the scallops & avocado into similar sizes & mix everything into the chilled tomato juice along with the prawns & chopped spring onions.
Serve in small glasses, scattered with coriander. Serve with Gourmet bread.