Firstly, In a mixing bowl, add mayonnaise, veggies, and seasonings. Mix everything well.
Cut the brown edges of the bread (optional).
Apply butter on both slices of bread.
Spread veg mayo mixture generously on one slice of bread.
Then, cover and press with another bread slice over it. Cut the sandwich into triangles or squares.
Serve Mayonnaise Sandwich with tomato ketchup.
Notes
Cooking Tips
Toast the bread: You can toast the sandwich on a tawa, use a sandwich maker, or grill it until golden brown and crisp. This will add a nice crunch to the sandwich and prevent the mayonnaise and veggies from becoming soggy.
Butter: Applying butter to the bread acts as a moisture barrier, which slows down the transfer of moisture from the filling to the bread, preventing it from becoming soggy. So, do not skip this step.
Variations
Cheese: If you like your sandwiches cheesy, add shredded cheese, such as mozzarella, cheddar, or a cheese slice, in between, and then grill the sandwich.