In a large pot, melt the butter and soften the onions for 2 minutes.
Drop the carrots, potatoes, garlic, ginger, and broth in the pot. Bring to boil.
Reduce heat, cover, and let it simmer for 20 mins
Let it cool down a little then use a hand mixer to blend everything together.
Taste and add salt to taste. I would not recommend not to add pepper at this stage, I find it gives an off-taste when reheated and prefers to crack some fresh pepper just before eating it.
Transfer leftover into a freezable container and throw in the freezer.