Turkey Cobb Salad Sandwich

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One 5 1/2 to 6 pound whole turkey breast with skin and bone

1 large onion, chopped

3 carrots, chopped

2 bay leaves

1 teaspoon whole black peppercorns

1/4 cup plus 2 tablespoons distilled white vinegar

6 bacon slices

1/2 pound poached turkey breast

4 slices pain de mie or other firm white sandwich bread (about 1/4 inch thick)

2 ounces blue cheese (softened)

2 tablespoons mayonnaise

1 firm-ripe California avocado

4 small crisp lettuce leaves (romaine)