Cook string beans in a large saucepan of salted boiling water until slightly tender, about 2 minutes. Using a slotted spoon, transfer the bean to a bowl of ice water, this is to stop them from cooking. Once they are cool, remove, and drain.
Cut the bean into bit sized pieces, about ½’’.
Add the orzo to the water the string beans were cooked in and cook according to directions on box, about 9 minutes. When cooked, strain and set aside to cool.
Mix together the orzo, string beans, fennel, cucumber and dill. Season to taste.
For the dressing
Combine the lemon juice, vinegar, and dill. Slowly whisk in the olive oil. Season with salt and pepper. Then mix in with the pasta salad.