Add a tablespoon of olive oil in a pan. Toss in your onions. Stir them around until they look kind of see-through or translucent. This should take about 5 minutes.
Stir in tomato paste until it changes from bright red to darker red. This takes around 3 minutes. If stuff sticks to the bottom of the pot, add a little water or broth.
Mix your soup with an immersion blender if you like it a little smooth. Or you can put some of it in a regular blender and then put it back in the pot.