Heat oven to 220C. In a roasting dish, toss beetroot and garlic with olive oil, salt and pepper. Roast 10-15 minutes, until beetroot slices caramelise and garlic is golden brown (not burned!).
Meantime, toast walnut in skillet (cast iron if possible) over medium heat to toast for 5 minutes, stirring. Add syrup, cinnamon and a pinch of salt and toss to combine. Cool in pan.
Prepare dressing: Drain cashews and blend with other ingredients until smooth. Adjust seasonings to suit your taste. It should be zingy, salty, and lemony with a bit of cheesiness – lots of flavour is good!
In the serving bowl, toss radicchio with lemon juice, salt and pepper. Add cashew dressing and toss to coat. Top with beetroot, walnuts and parsley and serve.