Place garlic in a small pot and cover with neutral oil, bring to a simmer, then cook until tender (about 10 minutes).
While the garlic is cooking, separate the Swiss chard stems from the leaves and cut up the stalks into bite-sized pieces. Place the stalks in a pan then cover and sauté for 7 minutes until they are tender.
Next, add the leaves and sauté until they are cooked (it shouldn’t take long at all).
Add extra salt, pepper, and mustard and give it a good mix. Strain the garlic but keep the oil, it's delicious! Dress on a plate using a few tablespoons of garlic oil (more if desired), then put the confit garlic on top. Eat it with friends and loved ones.