Peel crab rolls with shrimp and blanch in boiling salted water. Allow them to cool. Cut the shrimp and crab rolls finely. Remove the skins and cut grapefruit thus obtained fillets. Allow the pieces to squeeze grapefruit juice nice. Mix and stir shrimp, crab rolls and pieces of grapefruit, sour cream. Season with salt, chopped dill, garlic sauce 2-3 drops Tabasco and mustard. The resulting salad you can leave in a closed box until the presentation with avocados. Cut two avocados and scoop so obtained shells. Spray shells with lemon juice to not tarnish. Take half of the flesh of the avocado, cut it into small pieces. Rest of avocados can be saved in a box, sprinkled with lemon juice and later to make guacamole. Mix salad with avocado slices and fill 8 shells of avocados. Decorate each piece lodchitsa with smoked salmon, red caviar and lime.