Season chicken cutlets with blackening seasoning, and kosher salt and black pepper. In a large pan cooked over a medium heat fire cook the chicken for 3-4 miutes per side. In a large bowl mix all the ingredients thinly sliced large fennel bulb, chopped fennel fronds, celery ribs, red onion, 2 tablespoons olive oil, and fresh lemon juice. add in the avocado and crumbled feta, season with kosher and black pepper, serve with chicken,.