Prepare the fruit and place on a serving plate, sprinkle over the cinnamon.
Place the dark chocolate in a heatproof bowl and melt in the microwave on a low heat, keep checking to ensure it doesn’t burn (if you don’t have a microwave place in a heatproof bowl over a pan of simmering water).
Once melted place in a serving bowl, add the sea salt and drizzle over the peanut butter slowly for a swirl effect. Nut butters have different consistencies, if the one you’re using has a thick texture you can place in the microwave and melt slightly on a medium heat for 30s–60s to make it easier to combine with the chocolate.
Serve the peanut butter fondue with bananas and berries.