Purchase milled flax seeds or grind whole flax seeds in a coffee grinder. Keep them in a covered container and store them in your refrigerator, or freeze some of them if you have a large amount (more than what you'll need for a week or so).
Flax Seed Oil
If you don't want to eat the flax seeds, you can buy flax seed oil. It won't have the fiber, but it still has the fatty acids. Always keep flax seed oil refrigerated; use the oil to make salad dressings or add it to cooked vegetables. Don't use flax seed oil as a cooking oil - it can't take the heat and will burn.
One teaspoon of ground (milled) flax seeds contains 0.7 gram polyunsaturated fats (mostly omega-3 fatty acids), 6 milligrams calcium, 0.7 gram fiber and 13 calories.
Recipes that Include Flax Seeds
Source:United States Department of Agriculture National Nutrient Database for Standard Reference. "Seeds: Flax Seeds." Accessed April 14, 2011. http://www.nal.usda.gov/fnic/foodcomp/search/