- Cook the quinoa according to the pack instructions. Drain well and leave to cool.
- Combine the avocado with the lime juice. Break up the mackerel into bite-sized pieces.
- Layer up your jar. Start with the mackerel and sauce on the bottom, followed by the cooked quinoa, black beans, sweet corn, avocado and tomato. Seal the jar.
- To eat, tip all of the ingredients into a bowl, toss together and enjoy.