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I am lucky enough to have two Sous-Vide machines. The picture on the left is my Anova Sous-Vide which can connect to a vessel up-to 20 L. Preheat your Sous-Vide to 186 degrees for 90 min. I give it a head start by using tap water and boiled water so I do not have to wait to long for it to come up to temp.
Place potatoes in a Vacuumed sealed bag. I made Lamb that night so I used the left over Rosemary I had with a little butter. Use what ever herbs or fat you want or none at at all. I also used the Waring Vacuumed sealer which is fast and convenient.
Submerge in water bath and cook for 90-120 minutes. Make sure it remains under the water.
When all done toss in a fry pan and cook with your favorite herbs and spices. Fry until you get some color on them.
Serve on a platter.
ALL DONE AND EASY!!!
Update: 5/24/14
Sous-Vide at 183 degrees for 2 hours. I tossed in butter and spices. When completed I cut them in half and sauteed in the butter that was in bag. They were awesome!!!!!