Special equipment: wooden skewers
In a bowl, whisk together the agave, lemon juice, allspice and cayenne. Add the pear cubes and gently toss to coat. Thread 1 cube of pear onto each skewer. Heat a skillet over medium-high heat. When the skillet is hot, add the skewers and cook until the pear becomes golden brown, about 30 seconds on each side. Remove the skewers from the skillet, add a cube of Brie to each, and thread the prosciutto the skewers. Serve immediately with lavash or crackers.