Drain salmon, remove skin and bones, and flake. Place salmon in a large bowl. Add onion and next 5 ingredients. Stir in eggs and matzo meal. (Batter will be wet.)
Shape salmon mixture into 14 (1-inch-thick, 2-inch-wide) patties.
Cook, in 2 batches, in hot oil in a large skillet over medium-high heat 2 to 3 minutes on each side or until golden brown and crispy. Drain on a paper towel-lined wire rack. Sprinkle with kosher salt, if desired. Serve immediately over mixed baby salad greens with Lemon-Dill Sauce and, if desired, Thin Potato Kugel.
To Make Ahead: Prepare recipe as directed through Step 2. Place patties in a lightly greased aluminum foil-lined pan. Cover and chill 24 hours. Let stand at room temperature 10 minutes. Proceed with recipe as directed.