1. Wash and cut the zucchini into spaghetti or julienne using a mandoline, grater, or even a knife. Crush the tomatoes, chop the garlic, and slice the onion. Set aside.
2. In a saucepan, pour the crushed tomatoes with the chopped garlic and add the sliced onion when the mixture starts to boil. Reduce the heat and add salt, pepper, and Espelette pepper.
3. In a small skillet, cook the chicken breast without searing it with 1 tablespoon of tomato mixture.
4. Steam the zucchini for about 10 to 15 minutes.
5. When the chicken is cooked, slice it and keep it warm. When the zucchini is cooked, set aside a little bit (for presentation) and pour the rest into a wok or sauté pan.
6. In the tomato mixture, add half a brick of tomato sauce (75g) and take 2 tablespoons of this mixture to pour into the zucchini. Simmer for a few minutes. Add half of the remaining tomato sauce to this mixture.
7. Proceed to plating. Arrange a bed of tomato zucchini in your plates, using a cookie cutter if possible. Continue with 1 tablespoon of the tomato/garlic/onion/Espelette pepper mixture, then the sliced chicken, and finally the remaining plain zucchini.
8. Garnish with the remaining tomato sauce and serve!