Hearty Instant Pot Chicken & Potatoes

large leek (white and pale green parts only), halved, washed and diced

/ 28 g of butter (salted or unsalted, or 2 tablespoons of olive oil)

medium chicken breasts (0.7 lb / 350 g ), diced

skinless chicken thighs (0.5 lb / 300g ), diced

large potatoes (about 1.7 lb / 800 g), diced into large cubes (larger than chicken pieces)

large carrot, sliced

garlic, chopped

frozen peas (optional)

bay leaves

cube of chicken stock (or 400 ml / 1.5 cups broth)

Zest of ½ lemon

lemon juice

+ ½ teaspoons salt

white or black pepper

(1 + ½ cups) water