Step 1

1 In a large skillet over medium-high heat, heat the oil until shimmering

Step 2

2 Add the kielbasa and cook without moving until browned on the bottom, 2 to 3 minutes

Step 3

3 Flip the pieces and cook until browned on another side, about 2 more minutes

Step 4

4 Decrease the heat to medium, add the lentils and stir to combine

Step 5

5 Cook, stirring frequently, until the lentils are warmed through, about 2 minutes

Step 6

6 Add the kale, water and vinegar, season to taste with salt and pepper (bearing in mind that kielbasa is salty and lentils may be, too) and cook, stirring frequently, until the kale has wilted some but still retains a green color, 2 to 3 minutes, adding more water if the mixture is looking dry

Step 7

7 Remove from the heat, divide among the plates or shallow bowls, and serve