In a stand mixer, combine flour, eggs, sugar, sourdough starter, 40 g milk, salt, and cooled tangzhong. Mix briefly, then rest 30 minutes.
Knead the dough for 5–8 minutes, then gradually add 175g softened butter. Continue kneading until the dough is smooth and elastic.
Place the dough in a greased or glass bowl. Cover and let it rise for 2–3 hours at room temp, then refrigerate overnight.
Roll chilled dough into a rectangle, spread filling evenly, then roll into a log. Slice into 8 rolls using unscented dental floss.
Place rolls in a buttered baking dish. Cover and proof for 3–4 hours, or until doubled in size.
Adjust proofing times to your kitchen temperature.
Psyllium husk adds great texture and thickness but chia seeds or cornstarch work fine as substitutes.
Nutrition:
Approximate per roll: Calories 350, Fat 18g, Carbs 40g, Protein 6g