Bring a pot of water to a boil. Add the orzo and cook for 8-9 minutes, stirring occasionally. Drain and set aside.
Cut the rough stems off of the asparagus. Drizzle with olive oil, salt and pepper and place asparagus on a baking sheet. Bake in the preheated oven for 15 minutes.
While asparagus is in the oven, roughly chop the walnuts. When the asparagus has 5 minutes left, add the chopped walnuts to the baking sheet to toast for the remaining 5 minutes. Set aside.
Using a sharp knife or mandolin, thinly slice the radishes. Set aside.
Assemble the salad: mix cooked orzo with roasted asparagus (I chopped mine into slightly smaller pieces), toasted walnuts, sliced radishes, crumbled feta and peas.
Make the dressing by whisking all dressing ingredients together well.
Toss salad with dressing. Optional to add fresh herbs on top to garnish.