Levi Roots founded the successful Levi Roots brand after appearing on Dragon's Den.
Levi Roots is the stage name of Keith Valentine Graham, a Jamaican-British musician and entrepreneur. His appearance on Dragon's Den helped bring his Reggae Reggae Sauce to a much wider audience and led to commercial development of the Levi Roots food brand.
This question is distinct from asking what percentage of equity he offered. The important identification is the entrepreneur behind the brand, while the sauce itself became the best-known product associated with his pitch. The brand later expanded beyond its original sauce into other food products and licensing opportunities.
People sometimes confuse the entrepreneur with the dragons who invested in or evaluated businesses on the programme. Levi Roots was a contestant and business founder, not one of the show's investor-panel members.