Bring a pot of water to a boil. Add sorghum penne and cook for 8 minutes. Drain, rinse with cold water and set aside.
Using a vegetable peeler, shave asparagus into thin strips. Place frozen peas into a small amount of boiling water. Cover and steam for 2-3 minutes. Drain and rinse with cold water.
In a large bowl, combine pasta and arugula. Toss with about 2/3 of the vinaigrette. Add shaved asparagus, peas, feta, and remaining vinaigrette. Toss. Sprinkle with some Parmesan shavings and serve.
Vinaigrette
Combine lemon, sunflower oil, lemon juice, thyme, and salt and pepper in a jar or beaker. Blend with an immersion blender. Drizzle in olive oil. Set aside.