It is subjective to determine who the best chef in Kenya and in the world is as there are many talented chefs with different styles and specialties. Some popular chefs in Kenya include Chef Ali Mandhry, Chef Raphael, and Chef Kiran Jethwa. In the world, some renowned chefs include Gordon Ramsay, Massimo Bottura, and Thomas Keller. Ultimately, the best chef is a matter of personal preference and can vary depending on individual tastes and experiences.