Serves 4 INGREDIENTS 1 medium leek, white and pale green only, sliced thin 1 large Spanish onion, peeled and sliced thin 2 sticks unsalted butter ¼ cup white wine 1 head cauliflower, trimmed, core removed and chopped (5 florets reserved and thinly sliced for garnish) Kosher salt ½ oz. best quality American paddlefish roe Best…