For the garnishes: Heat oil in a deep-fryer or heavy saucepan to 375 degrees F.
Put the capers in a fine-mesh strainer with a heatproof handle and lower the capers into the oil. Fry until crisp, about 30 seconds. Drain on a plate lined with a paper towel.
Preheat the oven to 375 degrees F. Line a baking sheet with a silicone mat.
Process the Parmesan in a food processer until finely ground. Put 3 cups of the Parmesan onto the prepared baking sheet. Bake until melted, about 5 minutes. Remove from the oven, allow to cool and harden and then break the frico into crumbles.
For the steak tartare: Put the diced steak, shallot, parsley, cornichons, olive oil and salt and pepper to taste in a medium bowl. Stir to combine and adjust the seasoning as needed.
For the tonnato sauce: Combine the tuna and its oil, mayonnaise, anchovies, anchovy oil, lemon juice, capers, cornichon juice, garlic, cayenne and salt and pepper to taste in a blender and blend until completely smooth.
For the chicories: Separate the escarole and radicchio leaves and tear them into bite-size pieces. Toss the escarole, radicchio, parsley, avocados, hearts of palm, olive oil and vinegar together in a large bowl. Season with salt and pepper to taste.
Spoon the tonnato sauce on the bottom of a platter. Top with quenelles or small scoops of the tartare and the chicory salad and garnish with the frico crumbles and fried capers.
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