Materials:
28 stone bricks
12 cobblestone slabs
4 netherrack blocks
Flint and steel
First, dig a 2x2x1 hole in the ground. Place down netherrack. Next, frame the hole with cobblestone slabs. Then, create a bench two blocks from the firepit using stone bricks (or any other desired material) finally, use flint and steel to light the netherrack.