Technically, if you're brewing a beer without hops, it's not really a beer. But there are reasons you wouldn't use hops in brewing, and if that's the case, you'll need to find ingredients that approximate the perceived level of bitterness or your beer will taste too sweet. Additionally, you'll want to select a recipe that will achieve a very dry result. Ingredients that will add some bitterness include:
Roasty malts Certain strains of yeast Spices Herbs
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