Peel and chop the onions and garlic. Clean the nettles. Place a pot filled with 1 liter of water over medium-high heat. Add a teaspoon of baking soda. To remove the sting from the nettles, blanch them in a boiling water for about 30 seconds, then remove them immediately. Place them in a bowl, filled with iced water.
Place a saucepan over low heat. Add the olive oil and the chopped onion. Fry for about 5 minutes. Add the chopped garlic and fry for another minute. Add the nettles and 1 liter of cold water. Increase the heat. When the soup starts to boil, remove it from the heat and blend it into a smooth soup, using a hand-held blender. Add a pinch of nutmeg and season to taste with sea salt and black pepper.
Chop the chives. Divide the nettle soup between your plates, add the chopped chives and chive flowers. Serve. To make it even more awesome, you can also add a bit of yogurt, nettle flowers or a poached egg.