Step 1

Mix garlic and mayonnaise in a small bowl. Squeeze about 1 tsp. juice from lemon half into bowl; season with kosher salt. Hang on to lemon.

Step 2

Spread a generous layer of seasoned mayonnaise over toast; shingle a few tomato slices on top. Sprinkle with chives, sesame seeds, sea salt, black pepper, and Aleppo-style pepper. Finely grate some lemon zest from reserved lemon over and drizzle with some oil.