Use a knife to slice about 1/4-inch from the top to remove the stem. Firmly hold the tomato, and slice it crosswise to the desired thickness.

Slice it in half, then cut out the center of each half to remove the seeds and pulp. Slice what remains into thin strips, then cut across the strips to make small cubes.

Slice once to create two halves. The two halves will look something like this. Place one half on the cutting board, cut side down. Note where the stem was. Slice in half, cutting from top to bottom.