Loaf made with 150ml of pickle brine, 50ml vinegar, 100ml water, 7g instant yeast, 500g bread flour. Kneaded 15 minutes in bowl, proved 3 hours at room temperature. Patted down, folded in caramelized onions, melted butter, and caraway seeds, proved another hour. Baked 10 mins at 485°F, then 20 mins at 415, then 10 mins at 375.