VOTE: The Next Iron Chef Secret Ingredient Bracket Challenge Round 2

There are some pretty strange and unusual ingredients that get used on The Next Iron Chef challenges. But what secret ingredients have been the hardest for the competitors to work with? The culinary team in Food Network Kitchens weighed in on this question and came up with eight of the most difficult secret ingredients from the previous four seasons.
But what's the absolute hardest ingredient used on The Next Iron Chef? You get to decide in this bracket challenge. In Round 1, you narrowed down the eight to four. In Round 2, you'll vote from among the top four.
How It Works
Round 1 was November 15-22. The top eight secret ingredients were narrowed down to four.
Round 2 is this week, starting November 22 at noon. The remaining four ingredients will get narrowed down to two. Vote below now.
Round 3 is the last week of November. The winner will be chosen from the two finalists. Vote starting November 29 at noon.
On December 6 we will announce the winner at noon.
The Secret Ingredients Up for Vote in Round 2
Gummy Candy: In Season 4, Episode 3, the chefs had to cook two dishes incorporating movie theater candy. Michael Chiarello used gummy bears in creating his dishes.
Tripe: In Season 1, Episode 1, the chefs were challenged to make two desserts, one of them using a savory ingredient. Tripe was among the options.
Tuna Jerky: In Season 4, Episode 6, the chefs had to bid on the amount of time it would take them to create a dish using an assigned ingredient. Elizabeth Falkner had 25 minutes to create a dish using tuna jerky, which ultimately won her the challenge.
Xanthan Gum: In Season 1, Episode 3, the challenge was all about using innovative appliances and ingredients, like xanthan gum (a food additive made from bacteria that's commonly used as a thickener and stabilizer).