Bring a large pot of salted water to a boil over medium heat. Add the orzo and cook until tender yet still firm, about 8 to 10 minutes. Drain into a colander and let cool.
Whisk together the Dijon, olive oil, and lemon juice in a large serving bowl. Season with salt and pepper, to taste. Add the cooled orzo, cherry tomatoes, almonds, red onion, green onions, basil, mint, and feta. Toss together and taste for seasoning. Add salt and pepper, if needed. Serve.