Generously oil a large cookie sheet or jelly roll pan with vegetable oil. Set aside.
Add sugar, water, and corn syrup to a saucepan, stir to combine, and place over medium-high heat. Bring to a boil and heat without stirring, until a candy thermometer reaches 300°, about 10-12 minutes.
Stir in baking soda (make sure there are no clumps in your tablespoon, and sprinkle it over the candy mixture, don’t just dump it in; you don’t want lumps in your finished product) and pour quickly onto the oiled baking sheet. (The candy will bubble up and become amber in color when you add the soda.) Let harden completely, then break into pieces.
Melt chocolate chips, adding a teaspoon or two of vegetable oil (or shortening) if needed. Dip the hardened honeycomb candy in the chocolate and place on waxed paper to set. Enjoy frivolously.
Notes
If you want a thicker honeycomb, use a 9x9-inch pan lined with foil and sprayed with nonstick cooking spray.