How to Make It
Make the espresso hot fudge: In a small bowl set over a pot of boiling water, combine chocolate, heavy cream, corn syrup, and instant espresso. Cook, stirring with a rubber spatula, until smooth, 4 to 5 minutes. Keep warm.
Make the caramelized bananas: Place bananas, cut side up, on a wire rack set on a baking sheet lined with parchment paper. Place sugar and 1/2 cup water in a small saucepan. Cook over moderate heat until mixture is amber, bubbles are thick, and a candy thermometer registers 375°F, 16 to 17 minutes. Immediately brush caramel over bananas; let stand until cooled completely and hardened, about 30 seconds.
Make the sundaes: Place bananas, caramel side up, in serving dishes. Top evenly with ice cream, hot fudge, strawberries, peanuts, and pineapple. Serve with whipped cream.