Black garlic steak with Jerusalem artichoke purée

1. Fill a medium saucepan with water and add the lemon juice. Peel the artichokes and cut into 1cm pieces, putting them in the water as you do so. Cover, bring to the boil and simmer for 35-40 minutes, until the artichokes are tender. Drain and leave to steam dry for a couple of minutes, then return to the pan with the milk. Blend with a stick blender (or jug blender) until smooth; season. 

2. While the artichokes are cooking, brush the steaks with ½ tbsp oil and the mashed black garlic; season. When the artichokes have 15 minutes cooking time remaining, heat a griddle pan until very hot and cook the steaks for 4-7 minutes, turning halfway, until done to your liking. Transfer to a board to rest. Halve any thick broccoli stems, cut the onion into slim wedges and toss both in the remaining ½ tbsp oil. Griddle for 3-4 minutes on each side until nicely charred and tender. Slice the steak and serve with the purée and vegetables.