Cut tomatoes in half cross-wise.

Cut hard-boiled eggs in half widthwise.

Scoop out tomato pulp to create space for the egg.

Insert egg halves into tomato halves, yolk side up.

Stack ham slices and roll up tightly.

Slice the rolled ham into thin strips.

Heap ham strips onto the egg-filled tomatoes.

Place lettuce on a platter.

Arrange the tomatoes on the lettuce-lined platter.

Prepare the dressing by mixing mayonnaise, brown mustard, lemon juice, salt, and pepper.

Top the tomatoes with the dressing or serve it on the side.

Garnish with chopped chives.