→ Next step in preparing doughTCR’s Sourdough Bread > Preparing the DoughMaking the LeavenJust a test When you have activated the starter and are ready to prepare the dough for a loaf of sourdough bread, make the leaven: Measure into a small mixing bowl: 50 gm warm water (approximately 80° F) 25 gm unbleached white bread flour 25 gm whole-wheat flour Add: 1 heaping Tbsp activated sourdough starter Mix with a spoon. Newly mixed leaven Cover the leaven and leave it to rise in an 80° F oven. Leaven covered → Next step in preparing dough