2 tablespoons olive oil
1 onion, thinly sliced
1 long red chili OR green serrano, finely chopped
1/2 teaspoon ground turmeric
1 teaspoon ground cumin
1/4 teaspoon freshly ground black pepper

8 1/2 cups / 2 liters good-tasting vegetable stock/broth

100g / 3.5 oz yellow split peas or brown lentils
1 1/2 cups cooked chickpeas, rinsed if using canned
2 cups / 350g cooked borlotti beans

fine grain sea salt

120 g thin egg noodles, fresh or dried
3 1/2 oz / 100g fresh spinach leaves, finely shredded
1/2 cup finely shredded cilantro leaves
2 tablespoons chopped fresh dill
juice of one lime

Toppings:
1 tablespoon olive oil
1 tablespoon unsalted butter
1 large onion, thinly sliced
100 ml sour cream or creme fraiche
50g / scant 2 ounces of toasted, chopped walnuts