Caramelized Onion and Feta Cheese Sandwiches

I was in the mood for a gourmet but light lunch today (I have a hockey game at 1:30) so I whipped up this delicious sandwich. I used half an onion to make half a sandwich (Mr. Barefoot stole the other half). If your spouse does not hijack your meals, half an onion is sufficient for a full sized sandwich for one person. If your spouse does, use a whole onion.
Ingredients:

• 1/2 medium onion
• 2 tbs butter (actually, right now, we're using vegan margarine)
• salt
• pepper
• 1 tsp sugar
• feta cheese, to taste (would also be good with goat cheese)
• fresh rosemary (if your awesome older sister bought you a rosemary tree)
• 1 small pita
  

Recipe:

1. Melt 1 tbsp butter in skillet over medium heat. Slice onion thinly into strips.
   
2. Toss onion in melted butter and allow to saute until soft.
   
3. Add sugar, salt, pepper, and remaining butter. (May need more butter if the onions start to burn).
   
4. Continue stirring frequently for approx. 6-10 minutes, then add rosemary and saute a little more.
   
5. Add feta, stir until softened.
   
6. Spoon into pita and marvel at how such a simple sandwich could be so delicious.