Mix the warm water, salt, and butter until salt is dissolved, then whisk in the starter.
Slowly mix in the flour until a dough forms. Once it comes together (still a little clumpy), cover and let rest for 20 minutes.
Knead for 5-8 minutes, until dough is smooth, then shape into a ball and place into a lightly oiled bowl. Cover and allow to rest in a warm spot for 2-3 hours.
After the dough has rested and risen slightly, portion the dough into 8 equal pieces, (each 100g) and shape into 8 little balls. Cover with a kitchen towel and let rest for another hour. You are now ready to roll your dough out for Lahmajo! Or, you can simply make plain pita by cooking them in a very hot, oiled, cast iron or stainless steel skillet on the stovetop for 2 to 3 minutes per side.