Jonray Sánchez-Iglesias from Portishead ran the Casamia restaurant in Westbury-on-Trym with his brother Peter.
The pair were named chefs of the year in the Good Food Guide 2015, and were described as "two little geniuses" by top chef Gordon Ramsay in 2010.
Hundreds of people attended the funeral at St Mary Redcliffe church.
The funeral has been held of a chef who ran a Michelin-starred restaurant in Bristol, who died of skin cancer at the age of 32.