4 1/2 ounces (a heaping cup) brown rice flour
2 ounces (~1/2 cup) sorghum flour
2 ounces (~1/3 cup) cornstarch
1 teaspoon baking powder
3/4 teaspoon coarse salt (plus additional for sprinkling)
1/2 teaspoon xanthan gum
6 tablespoons cold butter, cut into pats (you can substitute shortening for a vegan version)
3 tablespoons sesame seeds (or a bit more, if you like it extra seedy)
~1/2 cup cold water
Preheat your oven to 400° Fahrenheit. Take out two cookie sheets, a rolling pin, and a few sheets of parchment paper.
In a food processor or large bowl, mix together the rice flour, sorghum flour, cornstarch, baking powder, salt, and xanthan gum. Add the butter, and pulse (if using a food processor) or cut with a pastry cutter or two knives until it's reduced to little oatmeal-sized bits (don't over-process, as you want your crackers to be flaky). Turn the mixture into a large bowl, and mix in the sesame seeds. Add the water, starting with a scant half cup at first and adding more as necessary, until the mixture comes together in a nice ball of dough.
Divide the dough in half. Leave half in the bowl (covered, so it doesn't dry out), and place the other dough ball between two sheets of parchment paper. Roll out with a rolling pin until it's quite thin, ~1/16th-inch. Cut into cracker shapes of your choosing (you can use a pizza wheel to cut squares or rectangles, or make things more difficult for yourself and cut out rounds and re-roll the scraps). Place the crackers on a parchment-lined sheet (you don't need too much space between), dock them a few times with a fork so that they don't puff up, and sprinkle with bit of additional salt. Bake until browned, ~15 minutes. Let cool slightly, then serve with cheese to celebrate world travel.