Tomato Sandwich with Homemade Mayonnaise

To make the mayonnaise, add the egg, lemon juice, white vinegar, dijon mustard, and salt to a wide-mouth jar.

Pour the avocado oil on top of the other ingredients.

Place an immersion blender at the very bottom of the jar, making sure it covers the egg yolk.

Blend on high speed without moving the blender. You will see the mixture at the bottom begin to emulsify and turn white.

Once the bottom half is emulsified, slowly tilt and lift the blender to incorporate the remaining oil until the mayonnaise is thick and creamy.

To prepare the sandwich, core the tomato and slice it into thick rounds.

Slice two pieces of crusty bread. Toast them if desired.

Spread a generous amount of the homemade mayonnaise on both slices of bread.

Layer the tomato slices on one piece of bread.

Season the tomatoes with salt and freshly ground black pepper.

Top with fresh basil leaves.

Place the other slice of bread on top, slice the sandwich in half, and serve immediately.