In a medium bowl, stir the gelatin into the boiling water. When the gelatin is completely dissolved, stir in the evaporated milk, pineapple, lemon juice, cottage cheese, celery, mayonnaise, and pecans. Pour the mixture into a 1½-quart square clear glass dish. Chill overnight, or until firm. Cut the chilled salad into squares and serve on lettuce leaves. Garnish with twisted lime slices.