First start by getting the fennel and apple roasted.
Preheat your oven to 350 degree. Spray your baking sheet with a bit of oil. Place the prepped fennel and apple into a large bowl and douse with oil, s&p. Toss to coat. Spread evenly on your baking sheet and place in your oven.
Roast 20-30 minutes or until the veggies are golden on the edges. Remove and allow to cool.
While the apple and fennel is roasting, get the kale salad started.
In the same large bowl, add your kale pieces, Dijon, lemon juice, salt, nutritional yeast and red pepper flakes. Wash your hands or use gloves, and get your hands into the greens. The lemon and salt will help break down the kale into a lovely tenderness. Basically your squishing the greens in the bowl. Repeat this for about a minute or so and you'll notice the greens turn very dark in color and soften, Once achieved, set the salad to the side.
Once the apple/fennel combination is done roasting and is cooled, add that to the kale and toss to coat. Taste and adjust seasoning as needed.