Bring a large pot of water to a boil.
Add the green beans and cook for 2 minutes. Drain the green beans and set aside.
In a large heavy bottom skillet, heat the olive oil over medium high heat. Add the shallot, garlic and red pepper flakes and sauté for 2 minutes until the garlic becomes fragrant. Add the green beans and mix everything together, making sure the garlic and shallots are evenly distributed amongst the green beans. Toss with cooked farro and feta.
Combine all the ingredients for the vinaigrette in a high powered blender and blend for 60 seconds until very smooth. Taste and adjust salt and pepper as needed. Serve immediately. Or you can refrigerate the vinaigrette for up to 3 days.
Drizzle with a few tablespoons of the vinaigrette. Season with salt and pepper and serve as needed.