Orzo Salad with Chicken and Vegetables

uncooked orzo

juice of 1 lemon (about 1/4 cup)

Dijon mustard

shallot, minced

extra virgin olive oil

salt and pepper

diced or shredded cooked chicken

of an English cucumber, chopped

large carrot, grated or julienned

red bell pepper, chopped

to 1 cup grape tomatoes, halved

chopped fresh parsley