Preheat the oven 180ºC.
Cut the onion & lemon into wedges, smash the garlic cloves (no need to peel them).
Peel the parsnip & carrot, then cut in half. Cut the potatoes into bite-sized chunks.
Put the chicken legs in a baking dish, and scatter the vegetables around them.
Add the bay leaves, season with salt &pepper, then squeeze the lemon wedges over everything. Put the lemon wedges between the chicken and veggies. Sprinkle the fennel seeds over the top, then drizzle with olive oil.
Put the dish in the oven and cook for 30 minutes. Give the veg a stir and turn over the chicken.
Cook for another 45 minutes or so, until the chicken is cooked through and the veggies are golden.
Serve warm with some leafy salad on the side.