For the Turkey
To cook turkey, bring 6 cups of water to a simmer with onion, lemon, bay leaves and marjoram.
Add turkey breast and cook, uncovered, just below a simmer until cooked through, about 20 minutes. Remove turkey, cool, chill and dice into 1/2-inch cubes.
For the Turkey Salad
For turkey salad, steep apricots in lemon juice and 2 tablespoons hot water until absorbed. Stir mayonnaise, yogurt, onion, lemon zest, marjoram and poppy seeds.
Stir in turkey and apricots, and season to taste. Chill until ready to serve.