Preheat oven to 325 F.
Generously grease and flour a bundt pan. Set aside.
In a medium bowl sift together flour, salt and baking powder. Set aside.
In a large bowl cream together shortening, butter and sugar.
Beat in eggs one at a time until batter is fluffy.
In a small bowl, mix together buttermilk and lime yogurt.
Alternate adding the buttermilk yogurt mix and the dry mixture into the wet batter.
Mix in vanilla extract, lime juice, and lime zest until well combined.
Spoon batter into prepared pan.
Bake for 1 hour and 15-20 minutes. (I check the center edges with a wooden skewer to make sure it is completely done)
Let cake cool before gently removing from the pan.
When cake has cooled completely drizzle with glaze.
To make the glaze, mix together powdered sugar and enough lime juice to create a thick, yet pourable consistency (think Elmer's glue) Stir in lime zest.
Serve cake garnished with lime slices, a sprinkling of lime zest, and vanilla ice cream or whipped cream.