Whisk together salt, sugar, yeast, and warm water in a large bowl.

Let the mixture sit until it froths (about 5 minutes).

Add flour and mix until well combined, adding more water if needed.

Cover and let rise in a warm place for about an hour.

Prepare a grill to medium-high heat.

Transfer the dough to a floured surface and knead until soft and silky (5-8 minutes).

Cut the dough into 8 equally sized pieces.

Roll each piece into a 6-inch diameter circle.

Brush one side of each bread with olive oil.

Place the breads on the grill, oiled side down.

Brush the upward-facing side with more oil.

Flip the breads when they begin to brown and puff up.

Cook the second side until nicely browned.

Remove from the grill and sprinkle with zaatar (optional).

Serve immediately.