A Vegan Alternative to Mayonnaise. Seriously] Creamy, Seriously] Good. We don't take ourselves too seriously but when it comes to our mayo, it's a whole different story. Rich, creamy, and irresistibly smooth, we're serious about it all. because that's how you make it Seriously] Good. Our Heinz Seriously] Good Mayo is made with 100% naturally sourced ingredients and absolutely no artificial colours or flavours, perfect for vegans and non-vegans alike. Our Heinz Seriously] Good Vegan Mayo takes your sandwiches, salads and chips to the next level or add to your favourite recipes for that delicious creamy and smooth flavour.