Grandma's Wilted Lettuce with Bacon & Balsamic - So Good!

Ingredients

• 6 slices thick-cut bacon (about 170g), preferably smoked
• 2 tablespoons water (30ml)
• 2 tablespoons bacon fat, reserved from cooking bacon (30ml)
• 2 tablespoons apple cider vinegar (30ml)
• 1 tablespoon balsamic glaze (15ml)
• 1 teaspoon Dijon mustard (5ml)
• 1/4 teaspoon black pepper (1.5ml)
• 1/8 teaspoon salt (0.75ml)
• 1 large head of leaf lettuce (about 300g), such as red leaf or butter lettuce, washed and roughly chopped
• 1/4 cup thinly sliced red onion (about 40g)