Cast Iron Blackberry Cobbler

1 cup 2(sticks) melted butter
2 cups whole milk
1/2 tsp vanilla extract
2 cups self rising flour
2 cups sugar
5 cups blackberries

On Grill
Set a two zone fire in a charcoal grill by placing coals on one side of the grill leaving the other side empty. Preheat grill.
Melt butter in saucepan, remove from heat.
add milk, vanilla, flour, butter and sugar. Stir together (Do not blend).
Prepare a 10" cast iron pan. Put Blackberries on bottom of pan and pour crust mixture over top.
Place pan on empty side of grill and place cover over grill. Let bake until top is brown should be about an hour.
Preheat oven to 350.
Follow rest of steps place pan in oven and bake 45-60 minutes.