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Preheat the oven to 375°F and put the grill in the middle.
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Cover a baking sheet with parchment paper.
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Separate the egg yolks from the egg whites. Put the yolks aside and whip the egg whites with an electric mixer until they make soft peaks.
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Gradually add ½ cup of brown sugar to the egg whites. Whip until it makes a meringue that is shiny and consistent.
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In the meantime, sift the flour, cocoa, baking soda and salt all together in a small bowl.
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In a larger bowl, cream the butter and ½ cup brown sugar. Alternate adding the dry ingredients and the black beer.
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Add the meringue to the mix by folding it gently.
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Pour the mix on the baking sheet and spread it out evenly. Place in the oven and cook for about 12 minutes or until a toothpick comes out clean.
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Remove from the oven and let cool completely.