Prep your bird: remove gizzards and neck, tuck wings behind if you'd like, tie legs together. Place bird in roasting pan.
Whisk together yogurt and spices (everything but the salt).
Using your hands, slather the bird with the spiced yogurt, inside and out. Get in there! Get in between the meat and the skin! Slather it good.
Roast for the first 30 minutes at 400 and then lower oven to 350F for the next two and a half hours. Cook until the interior temperature of the bird hits 165F.
Remove from oven and brush with glaze.
How to make glaze: simmer tamarind pulp and water for 10 minutes over medium heat. Strain pulp and pour back into saucepan. Whisk in sugar and syrup, and simmer for 5 more minutes. Glaze roast turkey and serve on the side to drizzle over meat.