Pour almonds into your food processor and pulse/process until the almonds go from whole to coarsely chopped to crumbly to finely ground. If they aren't coming together easily, add up to 1 Tablespoon of oil such as canola oil, peanut oil, or vegetable oil. Process again until the almonds resemble a thick and relatively smooth almond butter.
Store in the refrigerator for up to 3 weeks. But it won't last that long!