Alu Gouranga para o Aniversário da Hima! • Batatas Gratinadas Especiais

450g paneer 10 medium potatoes 1 teaspoon asafoetida 3 teaspoons salt 1 teaspoon black pepper 3 tablespoons chopped fresh cilantro 3 tablespoons ground coriander seed 725ml sour cream (or heavy cream/fresh cream) mixed with 1 teaspoon turmeric 100g butter 2 tablespoons powdered milk