Preheat the oven to 400 F.
In a roasting pan add half of the olive oil, the lemon juice of two lemons, 3- 4 springs of fresh thyme. Season with the sea salt and fresh ground pepper and mix everything together well.
Rub each artichoke half with the olive oil-lemon mixture and place it on the pan with round side up.
Roast for 3O min.
Take pan out of the oven and turn artichokes with the scooped up side facing up. Sprinkle the thyme leaves all over the artichokes. Roast for another 30 min or so.
Make the lemon & olive oil dressing
In a bowl add the remaining olive oil, the juice of the remaining lemons, the sliced scallions and a pinch of the dill. Season with sea salt and pepper to taste.
Place the artichokes on a serving plater. Toss all over the remaining dill and 1-2 tbsp of the lemon sauce. Sprinkle the feta cheese on top..
Serve with the lemony dressing on the side for extra dipping.