Turkey Roulade stuffed with fennel, apples and herbs

A special dish for your table for any family or friends gatherings. It is a perfect balance between sweet and salty flavors and the herbs add aroma and unique flavor.
Ingredients for the marinade:
1 turkey breast about 1800g
1 cup milk
1/4 cup lemon juice
1 tbsp kosher salt

Ingredients for the filling:
2 tablespoon butter
1 tablespoon olive oil
1 cup fennel bulb - small diced
1 cup apples - peeled & small diced (red apples: Fuji, Gala or Mackintosh)
2 garlic cloves, chopped
1/4 cup minced fresh tarragon
2 tablespoon thyme
1/4 cup breadcrumbs
1 teaspoon salt
1/2 teaspoon black pepper
zest of one lemon
melted butter for brushing the turkey breast

Ingredients for the sauce:
3 tablespoon butter
3 tablespoon flour
2 cups chicken stock
2 tablespoons heavy cream
turkey pan drippings
1 tablespoon minced tarragon
1 teaspoon thyme
Salt & pepper to taste