To provide another data point, I don't use mustard in my homemade mayonnaise — just oil, egg yolk, salt, garlic, and lemon juice — and when I use olive oil, the

To provide another data point, I don't use mustard in my homemade mayonnaise — just oil, egg yolk, salt, garlic, and lemon juice — and when I use olive oil, the mayonnaise comes out slightly green.