Finely chop onion. Fry for 8 min stirring on medium heath in garlic infused olive oil add spinach and tomatoes and sauté for 2-3 min until spinach start softening then turn the heat off put a lid on and let them steam in the leftover heath

Then very thinly slice potatoes on mandolin. Mix it with carrot shreds. Put half of it in large baking dish and mix it with spinach mixture from the pan. Then cover the mix with the rest of potatoes and carrots. Let some tomatoes pop out through the first layer if you wish. Spray with olive oil and bake for 50 min - 1 hour on gas mark 6 or 7 to crispen up top (180 degrees)