Sauté the bacon strips over medium heat until crispy, about 15 minutes. Remove the bacon with a slotted spoon.
Run the bacon fat through a fine sieve to remove bacon remnants.
You will need ½ cup of bacon fat. Add olive oil to bacon fat if needed to reach the ½ cup.
In a small sauce pan, heat bacon fat over medium low heat.
Add the balsamic vinegar, lemon juice, Dijon mustard and agave. Season with salt and pepper. Whisk to emulsify the dressing.
Place the spring mix in a bowl and toss dressing.