For the Salsa Verde: Combine all ingredients in a bowl, tossing until thoroughly mixed.
For Assembly: Lightly toast the flatbread in oven. Smear 4 of the flatbread pieces with 1/3 cup Salsa Verde. Layer with sliced porchetta, fontina, arugula and onions. Cover with remaining flatbreqd. Press in Panini press until melted. Serve.
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