Prepare the ingredients as instructed.
In a bowl, mix the ingredients for the mayo.
Optional: Toast the bread.
Spread the mayonnaise over one side of each slice of bread.
Layer with roasted turkey with a squeeze of lemon to taste, smashed avocado with lime and pepper, and microgreens.
Close the sandwich and slice in half.
Combine the sparkling water, lemon, and chia seeds. Let stand for 5 minutes, then stir again. Add ice before serving if preferred.
Serve the sandwich with carrots and roasted red pepper hummus and lemon chia sparkling water.