Heat oil to 375 degrees F in a deep fryer.
In a skillet, melt the butter. Add garlic slices and brown, then remove from butter and set aside.
Place a large handful of fresh spinach in a fryer basket, and submerge to cook for thirty seconds. Drain spinach on paper towels and repeat with remaining spinach. Pour garlic butter over top and add a little kosher salt and coarse black pepper to taste.