"Don't be afraid," author Jennifer McLagan writes. "Toast that bread until it is burnt on the edges and very dark in the middle." And she's right -- if you don't burn the toast, the finished soup will lack depth. Adapted slightly from &nbsp;<a href="http://www.amazon.com/Bitter-Worlds-Dangerous-Flavor-Recipes/dp/160774516X?tag=food52-20" target="_blank">Bitter: A Taste of the World's Most Dangerous Flavor, with Recipes</a> (Ten Speed Press, 2014).

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