“She brought back a haunch of goat and a basket of fruits and vegetables. Jhiqui roasted the meat with sweetgrass and firepods, basting it with honey as it cooked…” -A Storm of Swords
The argument was fierce over which of these dishes was better. Although different, both were very good. The metal skewers allowed the meat to cook perfectly so it was very tender, leaving all judgment hanging on the marinade.
The medieval goat dish was succulent and flavorful. The garlic, salt, and pepper are a tried and true combination, and one that in this case really complimented the slight gaminess of the goat. While it was tasty, it struck several of us as generically medieval (if such a thing is even possible). This dish seemed more appropriate to the clansmen in the Mountains of the Moon than the nomadic Dothraki.
In contrast, the modern dish made me feel like a princess on the plains of Vaes Dothrak. I could practically smell the sweat of horses and feel the wind blowing through grass tents. This dish had an exotic feel that was lacking in the medieval version, and that, for me, made the difference. The complexity of the ingredients, and the interplay of sweet, tart, savory and spicy is lovely, and I found myself tempted to lick the plate at the end of the meal.
Bottom line? Medieval if you want medieval, Modern if you want Dothraki.