Cook pumpkin and potatoes in boiling water until soft.
Heat cooking oil over medium heat. Cook onion until soft. After 2 minutes add garlic and cook for 2-3 minutes more, or until onions are soft. Stir regularly.
When soft, add green beans. Reduce heat to low. Season with black pepper. Add water and cook 15-20 minutes. Add more water if needed while cooking.
In meantime, make burger patties. Grate zucchini, add salt and let sit for 5 minutes. After 5 minutes squeeze out as much liquid as possible.
Combine grated carrot, zucchini, flour, oats, panko, salt, a lot of black pepper, cumin, garlic powder and egg (or egg alternative). Mix well.
Heat cooking oil over medium-high heat and cook patties on both sides until browned.
Mash potatoes and pumpkin. Season with salt, black pepper, and nutmeg. Add water, butter, milk or egg if desired.