My grandmother lived for summer afternoons just so she could make this. Just 3 ingredients for the most juicy, savory, and nostalgic bite you will have all season.

There is hardly a more honest summer sandwich than a tomato sandwich, especially when the tomatoes are ripe enough to perfume the whole kitchen. This is the kind of plain, perfect lunch that generations across the Midwest have made without much fuss at all: soft white bread, a generous swipe of mayonnaise, and thick slices of juicy tomato. When garden tomatoes are at their peak, those three simple ingredients turn into something wonderfully savory, cool, and nostalgic.
Serve this sandwich with a handful of plain potato chips, a dill pickle spear, or sweet corn on the cob for an easy summer meal. It also goes well with iced tea, lemonade, or a cup of simple vegetable soup if you want to round

Ingredients
2 slices soft white bread
1 large ripe tomato, sliced thick
2 tablespoons mayonnaise
Directions

1. Lay the bread slices on a clean work surface and spread 1 tablespoon of mayonnaise evenly over each slice, reaching all the way to the edges.
2. Arrange the thick tomato slices over one piece of bread, overlapping them slightly so every bite gets plenty of tomato.
3. Top with the second slice of bread, press very gently, and cut in half if you like. Serve right away while the bread is still soft and the tomatoes are cool and juicy.
   Variations & Tips
   Salt and pepper addition: Even though the classic version is just three ingredients, a light sprinkle of salt and black pepper over the tomato slices brings out even more flavor if you do not mind stepping beyond the original simplicity.
   Choose the right tomato: The very best sandwich comes from a ripe summer tomato that feels heavy for its size and smells fragrant at the stem. Beefsteak and other large garden tomatoes are especially fine here because they give you broad, juicy slices.
   Keep the bread soft: This sandwich is at its finest with tender white sandwich bread that gives a little when you bite into it. Toasted bread changes the character completely, so if you are after that old-fashioned version, keep it soft and fresh.
   Prevent sogginess: If your tomato is extra juicy, let the slices rest for a minute on a paper towel before building the sandwich. That small step keeps the bread from soaking through too quickly while still leaving plenty of tomato goodness behind.
   Make it a little heartier: If you want to stretch this into a more filling lunch, add a leaf of crisp lettuce or a slice of mild cheese. It will no longer be the strict three-ingredient sandwich, but it will still carry that same fresh summer spirit.