In a microwave safe dish, combine chocolate chips and shortening. Cook on high until shortening is melted and chocolate chips have soften about 15 seconds. Remove and stir until chocolate is melted and smooth.
Add strawberries and ice cream to Twister Jar; push ice cream down to blade and place Twister Lid on jar. Hold Twister Lid and with the other hand press "Speed Up", turn Twister Lid counter-clockwise during blending and run until nearly smooth. Press "Pulse" to stop blender. Add melted chocolate. Replace lid and press "Pulse" until chocolate is evenly distributed throughout the shake.