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Make chickpea patties: In a 3- to 4-qt. pan, mix chickpea flour and dry seasonings. Gradually whisk in 2 1/2 cups water until smooth. Cook over medium heat, whisking often, until mixture begins to thicken, 3 to 5 minutes. Switch to a spoon and stir until mixture pulls away from pan bottom and mounds in center of pan, 4 to 6 minutes. Stir in parsley. Using an oiled spoon or fingers, evenly spread mixture in an oiled 9- by 13-in. pan. Let cool.
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Make mayo: Mix all ingredients together in a small bowl. Chill, covered.
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Make slaw: Whisk together vinegar, oil, salt, and pepper in a medium bowl, then gently stir in carrots and radishes.
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Now for the sandwiches! Preheat broiler and set a rack 4 in. from heat. Split rolls, leaving one side attached, and open up. Place rolls cut side up in a large rimmed baking pan; lightly brush tops with 1 tbsp. olive oil. Broil until golden, about 1 minute. Tip onto counter and drape with foil.
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Oil the baking pan. Brush chickpea mixture with 1 tbsp. olive oil; sprinkle with salt. Cut into 12 rectangles and set slightly apart in oiled pan. Broil until golden, 4 to 6 minutes. Turn patties over and broil until golden on second side, about 2 minutes.
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To assemble, generously spread mayo on cut sides of rolls. Place some salad greens on one side of each roll and top with some carrot slaw, then 2 chickpea patties.
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*Find in the baking aisle of well-stocked grocery stores and at health food stores.
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Make ahead: Wrap and chill uncooked chickpea mixture and mayo up to 1 day.
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Note: Nutritional analysis is per sandwich.
