In a jar, combine the olive oil, vinegar, maple syrup and spices. Seal jar and shake vigorously for 30 seconds until emulsified (or use a blender to emulsify). Taste and adjust amount of vinegar or oil until you reach a balanced flavor.
In a large bowl, combine the rice, grapefruit segments, pistachios and scallions. Alternatively drizzle vinaigrette over the salad and toss, until well combined. Check the flavor as you go and use more or less vinaigrette as needed. Serve at room temperature.