Vegetable Gratin with Tomato
Preheat the oven to 180°C (approximately 350°F). Grease a baking dish with olive oil.
Peel the potatoes, zucchini, carrots and onion. Finely dice onion and and grate the rest. Rinse the parsley, pat dry, pluck off the leaves and finely chop. Stir together all the vegetables, parsley, Gouda cheese, eggs, and flour. Season with salt and pepper and transfer to the baking dish. Rinse and seed the tomatoes and cut into slices. Top the vegetables with the tomato slices and sprinkle with Parmesan. Bake for about 40 minutes until golden brown.
Slice gratin to serve and serve with arugula, if desired.