Mix all the ingredients, except the walnuts, orange and honey, in your slow cooker. Cook on low for eight hours. If you’re an early riser, throw it all in and cook on high for three hours.
Serve with the chopped walnuts, orange zest and a drizzle of honey.
Tip: If it looks a little dry at any point, add a splash more milk. If cooking overnight, add a few extra splashes at the start so it doesn’t dry out.
