The slightly chewy texture of ruddy-red Wehani rice makes it perfect for salads. Serve it mounded on a bed of Boston lettuce or curly frisée.
Combine rice and water (2 cups water if using brown basmati) in a 3-quart saucepan; bring to a boil. Reduce heat to low, cover and cook until all the water has been absorbed, 40 to 45 minutes. Remove from heat; let rest, covered, for 10 minutes. Spread the rice out on a large baking sheet until cooled to room temperature, about 15 minutes.
Meanwhile, toast cumin in a small skillet over medium-high heat until fragrant and lightly toasted, 1 to 2 minutes for seeds, 1 minute for ground cumin. Transfer to a blender or food processor and let cool for several minutes. Add oil, vinegar, oregano, garlic, salt and pepper and process until the garlic is finely chopped.
Transfer the rice to a large bowl and toss with beans, scallions and bell pepper. Pour the dressing over the salad and toss well to combine.