Put the spinach and green onions in large salad bowl and sprinkle with the halved citrus supremes. In a small saute pan over medium heat, add the butter and sugar and stir until the butter is melted. Add the pecans and toss until the pecans begin to brown. Stir in the rosemary and cayenne and stir just a few seconds to release the aroma. Remove from the heat and season with salt and pepper, to taste. Sprinkle the pecans on the salad while still warm. Drizzle the dressing over salad and serve.
In a small bowl, add all the ingredients and whisk until emulsified.