Chia (Salvia hispanica) seeds.

Chia Seeds

Chia has become very popular in the recent years due to the fact that many people are looking for healthy alternatives to all the toxins we are fed every day.
Chia is a plant of the mint family. It was widely used by the NAHUATL or AZTEC ( as they are commonly known) therefore the name comes from the Aztec word CHIAN(oily). As you guessed the seeds are very oily so it is common to find Chia seed oil at your local organic health stores.
The seeds of this plant are considered to be "super food" as they are rich in Omega-3 Fatty Acids, Calcium, Phosphorus and Magnesium among other things.

WAY OF USE:

Soak them in water for about 30 minutes then add them in your smoothie, on your fruit salad or just eat it as is; it really depends on your taste. You can also grind the seeds then soak them in water for 10-15 min and use this mixture as an alternative to eggs when making muffins.

I personally like to eat them row as they would have most of their beneficial constituents intact.
Remember if you grind the seeds then it is best to use them as soon as possible.