Peel and wash the potatoes. Cook in boiling salted water for about 20 minutes. In the meantime, clean and wash the beans and cut them into bite-sized pieces. Also cook in boiling salted water for about 20 minutes.
Wash the herbs and dab dry. Roast pine nuts. Puree the herbs, half of the pine nuts, 50 ml olive oil and parmesan. Season with salt and pepper. Wash the fillets and dab dry. Peel garlic and press it through a garlic press.
Heat the remaining oil. Fry garlic and fillets for 5-8 minutes, turning them over. Season with salt and pepper. Swirl beans in melted fat. Press the potatoes directly onto the plates using a potato ricer.
Drizzle pesto on it. Sprinkle with remaining pine nuts. Serve with the fillets and beans. Serve generously garnished with fresh herbs.