Zest the lemon - you don't need to add the juice, but you can if you don't have another use for it.
Mix the vegetable oil, the spices and the lemon zest together in a small bowl. Add some salt and pepper too.
Chop up the vegetables and put them in a roasting pan. I make the potatoes about half an inch in size and cut everything else into inch-sized pieces. I also make sure I do the aubergine last so it doesn't start to go brown.
Tip the spice mix onto the veggies and toss it around to get a good coating.
Roast for about 25 mins and then add the chickpeas (and meatballs if you want to) and give it all another toss around.