Students were visited by Reggae Reggae sauce inventor Levi Roots last week who shared how he created the brand.
Mr Roots spoke to the Thames Christian College pupils, in Wye Street, Battersea, invited students to present their own business ideas to him.
The Dragons Den star spoke about how the sauce outsold Heinz tomato ketchup in Sainsbury's stores the week it was launched.
He offered practical advice on how to work as an entrepreneur, adding personal anecdotes of success and mistakes he made along the way.
Pupils gave business pitches to Mr Roots who acted as a dragon.
The winning team came up with the idea to renovate second hand vans, personalising them for commercial customers and selling them on for a profit.
The college boasts a good relationship with Mr Roots, with his café next to the school providing school dinners.