An apparatus and blade assembly includes a first array of single-edged parallel metal blades, each blade in the first array having rounded ends with a sharpened interior curve, and a second array of parallel double-edged blades with a sharpened interior curve, both arrays being fixably attached such that the first array and the second array are sufficiently spaced to create a blade assembly. A two-sided blade assembly includes a first shorter projecting side including a first plurality of blades configured with interior cutting curves, the first plurality of blades including single-edged blades; and a second projecting side coupled to the first shorter projecting side, the second projecting side including a second plurality of blades having a decreased number of blades as compared to the first plurality of blades, each blade in the second plurality of blades being double-edged including a blade edge for the first shorter projecting side and a second blade edge configured for the second projecting side.