Pour beer and seltzer water ... mustard, salt and onion powder and oil. Pulse until ... only until mixed. Batter may still be slightly lumpy, ... sweet onions into rings. Separate rings. Soak in ... Great with batter-fried fish.
Mix first 3 ingredients. Add ... forms a paste. Batter should not be stiff. Dip and fully coat onion rings. Deep fry in hot oil, 360 degrees until golden brown.