1. To make the plum and chia ketchup, put all of the ingredients apart from the chia in a food processor or blender and blend until completely smooth. Transfer the liquid to a saucepan, bring to boil and simmer on a low heat for 20-25 minutes until the ketchup has thickened. Stir through the chia seeds , season with freshly ground black pepper and allow it to cool.
2. To make the burgers, remove the skin from 2 duck breasts and roughly chop them. Roughly chop the tomato and parsley and transfer all three ingredients to a food processor. Pulse until well combined and well chopped. Divide the mixture into two and form into burgers.
3. Heat a teaspoon of coconut oil in a frying pan over a medium heat. Cook the burgers for 5 minutes on each side or until completely cooked through.
4. To serve put the duck burger on a burger bun, top with chia ketchup, little gem lettuce, sliced tomato and avocado.