Mix the sliced vegetables in a large baking dish or on a baking sheet lined with baking paper.
Drizzle with the olive oil and a generous splash of balsamic vinegar, sprinkle with the Italian herbs, crumble the stock cube over it and mix everything with the water.
Stew it in 30 - 40 minutes until tender in the preheated oven.
Stir every 10 minutes so that all sides cook equally well.
Blend the cooked vegetables with 1 tbsp vegan pesto and the fresh herbs in a blender or with a hand blender.
Just before serving, season with salt and a dash of ketchup.
Eat the sauce over cooked spaghetti or macaroni. Serve with arugula and cucumber.