Hot answers tagged all-grain
Its two different options. You can either do the malt version or the extract version. Wheat Liquid Malt Extract is actually a mix (usually 50/50) of wheat malt and pils/2-row/pale malt, depending on the manufacturer.
Hulled barley is about 2% fat by weight. That's almost certainly why we see a slight oil-slick on the wort before it boils. I'm not sure why you don't see it when you're boiling inside. It could be like you say,that the rapid speed of the outdoor boil has something to do with it. Or it could be that the light is brighter outside, showing the oil more ...
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