Preheat the oven to 425°F.
In a large bowl, whisk together olive oil, garlic, lemon juice, miso paste and salt and pepper.
Add the radish in the bowl and toss until they are evenly coated with the dressing.
Transfer onto a parchment lined baking sheet and bake for 20 minutes, turning them halfway through the roasting process, until golden brown. Season with salt and garnish with parsley.