no-knead sourdough combo 1st attempt

inspired by Julie's no-knead bread, I set out to make a loaf with sourdough. This recipe scared me because I've never made sourdough without yeast.

my combo version was this:

1 cup fully active sourdough culture
3 cups flour, more for dusting
1 cup water
1 packet yeast (dissolved in warm water)
1.5 teaspoons salt

I followed Julie's instructions, kind of. (In a large bowl combine yeasty water, water, and sourdough, add flour and salt. Stir until blended; dough will be shaggy and sticky. Cover bowl with plastic wrap. Let dough rest at least 12 hours, preferably about 18, and up to 24 hours, at warm room temperature, about 70 degrees.) I added red onions and cheese before the last rise. Next up: no-knead raisin bread.