Sourdough version  1000g batch at 70% hydration Ingredients 2 tablespoons butter 1-tablespoon olive oil 1 large white onion 780 grams bread flour 2 to 3 tablespoons poppy seeds 330 grams water 150 grams milk 27 grams salt Biga Biga Biga made with 220g of flour 220g of water 60 to 80g sourdough starter discard Stir…