Slice vanilla beans in half lengthwise with a sharp knife to reveal the inside of the vanilla pods. Cut if needed to make them fit into your jar.
Place the split beans in a tall glass jar. A reused maple syrup glass bottle or a mason jar both work.
Pour the alcohol of choice over the beans.
Cap tightly and shake gently.
Store in a cool, dark place for at least a month, shaking occasionally. I prefer to leave 2-3 months for better flavor. For an even stronger version, let it infuse for 12 months.
Notes
I use my vanilla extract straight from the jar and just replenish the alcohol as I go. You can continue using the same vanilla beans until you notice the extract losing its flavor.
If you need a sweeter vanilla extract for a recipe, just add a little raw honey or maple syrup for a corn syrup and refined sugar free option.