Inspired by the filmmaker's life experience, Ketchup & Soya Sauce is a feature documentary highlighting how partners in mixed relationships involving a first-generation Chinese immigrant and a non-Chinese partner celebrate and manage their cultural differences. The Canadian participants range in age from 20 to 90 years old and are in either a heterosexual or homosexual relationship. The documentary depicts an 80-year evolution in culture and attitude toward mixed relationships in both China and Canada. It explores the participant's social background and how their romance began as well as food habits, language and communication, intimacy, financial management, child education, pop culture, and culture shock. The documentary's tone mixes humor with reflective and emotional moments.