Store any leftovers in an airtight glass container in the freezer for up to 2 weeks. The texture will harden into a solid block of ice so it won't stay creamy like a bowl. You'll need to thaw it for 10 minutes before eating. To eat frozen leftovers, toss the block back into a high-speed blender with 2 tablespoons of warm milk. Blend for 30 seconds to bring back the smooth texture. Watch for ice crystals as a sign it's past its prime.