Make the croutons: Preheat oven to 375˚F. Slice the bread into ½ inch slices. Tear slices into bite sized pieces. In a large bowl, drizzle olive oil, salt ,and pepper over the bread cubes. Toss to combine. Pour croutons onto a baking sheet and arrange in a single layer. Bake for 15-20 minutes, until browned, turning once halfway through baking to make sure croutons toast evenly. Set aside to cool.
While the croutons are baking, heat olive oil in a large pot over medium high heat. Add onion, celery, mushrooms and carrots. Cook for 5-7 minutes until veggies have softened and mushrooms have started to release juices.
Add garlic and cook 1 minute, until fragrant.
Pour white wine into the pan, scraping any browned bits off the bottom of the pan.
Add lentils, herbs, and broth. Bring to a boil, cover, and reduce to a simmer. Cook for 35-45 minutes until lentils are tender, pouring in water as needed to make sure lentils are always just covered with liquid.
Remove from heat and stir in kale, coconut milk, and lemon juice, stirring to combine. Add salt and black pepper to taste. Top with cooled croutons to serve.