Heat oven to 400F (200C). Line two rimmed baking sheets with parchment.
Unroll one sheet of puff pastry. Cut pastry evenly into 4 strips. Cut each strip evenly into 4 parts to make 16 squares. Place on prepared pan, score 2 or 3 times with a fork and brush with egg wash. Bake until golden and puffed; about 14 minutes. Repeat with remaining sheet. Cool 5 minutes.
Spread each square with 1 1/2 tsp (7 mL) ricotta cheese. Top 16 squares with pear slices, walnuts and a drizzle of honey. Top remaining 16 squares with arugula, prosciutto and sun-dried tomatoes.