For each brussel sprout, remove any yellowed outer leaves from the brussels sprouts and slice off the dark tips at the ends and cut them in half lengthwise.
Give them a good soak in water and dunk it a few times to remove any dirt or soil from between the leaves. Drain them once they are clean.
In a skillet or frying pan, set to medium heat and add a little oil and butter
Once the pan is hot, and the butter has melted, add in the onions and cook them for approximately 1 minute
Add in the brussels sprouts into the pan and try to keep all the brussel sprouts flat side down to brown them (this will take approximately 3-5 minutes depending on how hot your stove is)
Once the brussels sprouts are brown on the flat side, add in the garlic and stir everything together. Flip the brussels sprouts and brown the rounded side of the brussels sprouts for a minute.
Once both sides are brown, stir everything together again for a few more seconds and add in 2-3 tablespoons of water and cook the brussels sprouts until the water evaporates.
Once it is brown, and bright green, transfer everything off the frying pan onto a plate.