To prepare the dipping sauce, place all of the ingredients into a small mixing bowl and whisk until well-combined. Refrigerate the sauce until serving time.
To prepare the fries, add the flour, cornstarch, baking powder, salt, garlic powder, and sesame seeds to a medium-size mixing bowl. Combine the ingredients with a fork. Add the club soda and soy sauce into the dry mixture and stir until just combined.
Heat the oil over high heat in a Dutch oven or deep-sided skillet. Use a thermometer to keep the temperature around 350°F-375°F. Line a baking sheet with paper towels.
Dip each green bean into the batter, coat completely, and add a handful to the hot oil. Fry for 2-3 minutes, or until golden brown. Place the fried green beans onto the baking sheet to drain and keep them warm in a 300°F oven while you coat and fry batches of the remaining beans. Serve immediately with the dipping sauce.
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