Spiralize zucchini or slice into ribbons using a mandoline or vegetable peeler. Toss with a pinch of fine salt and allow to stand for a few minutes.
Combine lime juice, ketchup, fish / soy sauce and oil in a small bowl. Taste and adjust seasoning with more lime / fish sauce / ketchup as needed. You’re looking for a balance between sour, salty and sweet.
Heat a little oil in a very hot wok or large frying pan. Add chicken and stir fry until just cooked through. Place cooked chicken in a small bowl.
Pat zucchini dry with paper towel. Return wok / frying pan to the heat. Add a little more oil then quickly add zucchini and sauce. Stir well and allow everything to warm for a minute or so. Remove from the heat and stir in the cooked chicken.
To serve, divide chicken and zucchini noodle mixture between two bowls. Top with coriander / cilantro leaves and extra lime.