Bring a large pot of well-salted water to a boil (I use 3 quarts water plus 2 tbsp kosher salt). Cook the orzo until just al dente, 8 to 9 minutes.
Drain in a fine-mesh strainer and rinse under cold water. Transfer to a large bowl and toss with 1 tsp oil to keep the grains separate.
Make the dressing
Whisk all of the dressing ingredients together until emulsified.
Assemble the Salad
To the bowl with the orzo, add the cucumber, tomatoes, drained onion, olives and herbs.
Pour over the dressing and toss. Fold in the feta last.
Taste and adjust the salt and lemon. Chill 30 minutes, or serve at room temperature.
Video
Notes
To avoid dry orzo salad: don't dress the orzo warm, or it will drink up all the dressing. Orzo is thirsty. Dress it cold, and reserve little back to add at the last minute if making ahead. Storage: fridge up to 4 days. Refresh with a splash of lemon and olive oil.Gluten free: use GF orzo or a small rice-shaped GF pasta.Make it a meal: add grilled chicken, shrimp or chickpeas.