In a medium saucepan with a lid, bring 2 cups of water to a boil. Stir in quinoa and 1/4 tsp salt. Boil and stir occasionally until quinoa starts to sprout. Test for doneness, it will be tender. Remove from heat and drain in a sieve. Cool to room temperature. Meanwhile, in a medium bowl, whisk together oil, lemon juice, and shallot; season with salt and pepper. Pour dressing on warm quinoa. Add cherries, herbs and walnuts and toss to combine. Season with salt and pepper. Optional: Crumbled feta cheese. Serve.