In a large bowl, mix starter and water until starter dissolves
Add flour and salt, mix until no dry flour remains
Cover and rest 30 minutes at room temperature (72-75°F)
During the next 2.5 hours, perform 5 sets of stretch and folds
Wet hands, grab dough edge, stretch up and fold to center
Rotate bowl, repeat 4 times
During second set, gently fold in garlic, rosemary, and cheese
Wait 30 minutes between each set