For the root vegetables, preheat oven to 180°C. Line a tray with baking paper. Lay out vegetables and drizzle over olive oil and salt. Toss to coat. Roast for 30-45 minutes until everything has softened and lightly charred. Set aside to cool slightly.
To make the herb dressing, combine all ingredients in a bowl and puree using a stick blender.
To serve, spoon dressing on to a large serving tray. Top with roasted root vegetables, rocket and pine nuts. Top with fennel fronds and serve immediately.
Notes
While this is a root vegetable salad, something like pumpkin, eggplant or zucchini would also work well. Use whatever you have available.
Other herbs you could use in the dressing: parsley or basil
If horseradish cream is unavailable (or not your thing), substitute with Dijon mustard.
Any roasted nut will work - I personally prefer pine nuts or crushed/flaked almonds. Alternatively, toasted bread would also be delicious.