Orange Blossom Honey Panna Cotta

Name: Orange Blossom Honey Panna Cotta
Ingredients: 1 cup whole milk; 3 cups heavy cream, divided; 2 long strips orange zest (taken pole to pole with a vegetable peeler, avoiding the white pith); 2 1/8 teaspoons agar agar powder (NOT agar agar flakes); 1 cup orange blossom honey, divided; 1 pinch salt; 1/4 teaspoon cream of tartar (or 1/2 teaspoon lemon juice); 1/8 to 1/4 teaspoons orange blossom water (optional); 3 tablespoons water; 2 oranges, cut into supremes; Several pulverized honey sesame candies (optional)