Preheat grill. In a heavy bottomed pot cook conch in water for 1 hour or until tender. Strain through a colander and let cool slightly. Rub cooked conch with 2 tablespoons olive oil and grill for 8 minutes or until slightly charred on the outside and allow to cool again. Afterward, slice conch into paper thin slices and return to a metal or non-reactive bowl and add additional ingredients and mix thoroughly. Serve chilled with avocado, sliced limes and cilantro sprigs.