To Buy: 
Buy dried leaves, seeds or powder from a good spice store with high turnover of produce. The dried leaves should be green, not brown.
To Store: 
Whole fenugreek seeds should be stored in an airtight container in a cool, dark place for up to 2 years.  Ground seeds should be used within 15 months of purchase.  Dried leaves will keep for up to 12 months in airtight conditions away from light and heat. 
Tips & Tricks: 
Fenugreek adds a bitter sharpness to Yemeni dips and sauces, and is traditionally an ingredient in many curry powders.  The leaves have a sweet grassiness and complement vegetables, especially peas.
Cooking Tips: 
Fenugreek seeds, whole and ground, are used to flavour many foods including curry powders, spice blends and teas.