why is ketchup red and mustard yellow?

预售woeberx27syellowmustardsauce韦贝尔黄芥末酱低蛋白墨西哥胡椒

appel delicious herring fillets in mustard sauce a la dijon

预售woeberx27syellowmustardsauce韦贝尔黄芥末酱低蛋白墨西哥胡椒

cherry artisan mustard