Cooking with Claud: Creamed Peas

INGREDIENTS:
— 2 tbsp olive oil
— 1 medium onion (finely chopped)
— 2 tbsp all-purpose flour
— 1 cup low-sodium vegetable or chicken stock
— 1/2 cup of half & half
— 1 package of peas
— 1 lemon (zested)
— (optional) mint