Prepare grill for medium direct heat. Grease the centre of a 20 x 18 inch sheet of heavy duty aluminium foil with margarine. Arrange 2 slices each of red onion and lemon over the margarine. Sprinkle with one tablespoon of almonds, and half of the green onions. Arrange the fillets in a single layer over the onions, lemon and almonds. Top with remaining red and green onions, lemon and almonds. Sprinkle lightly with salt, pepper, and paprika.