First make the raspberry sauce. Put the ingredients in a small pan, bring to a simmer and cook for 15-20 minutes, until it reduces to a thick sauce. Set aside.
Meanwhile put the waffle ingredients in a blender and whiz until you get a smooth batter. Rest in the fridge for 15 minutes.
When the raspberry sauce has cooled down, add 2 Tbsp to the batter.
Heat the waffle machine. Once it’s hot, spoon in the batter and seal. Follow the machine instructions to cook approx. 4 waffles. Keep them warm on a plate, covered, whilst you’re cooking the next one.
Mix the yoghurt with the raspberry sauce.
Serve the warm waffles with some raspberry yogurt drizzled on top.