In a large mixing bowl, whisk together the flour, baking powder, salt, sugar and yeast.

Add in the warm milk in small increments and vegetable oil, and mix well to form a soft dough. Knead the dough for a few minutes until it becomes smooth and elastic.

Cover the dough with a damp cloth and leave it to rest for about 30 minutes in a warm place.

Preheat your grill to high heat.

In a small bowl, mix together the minced garlic, chopped coriander and melted butter.

Divide the dough into 4 equal parts, and roll each part out into a thin circle.

Brush the garlic and coriander butter over one side of each naan.

Place the naans buttered side up on the grill, and cook for about 2-3 minutes, or until the naans start to puff up and turn golden brown.

Flip the naans over and cook for another 1-2 minutes, or until the other side is also golden brown.

Remove the naans from the grill and serve hot.