Summer Tomato Sandwich

1. In a small bowl, mix together the mayo, garlic, and horseradish with a sprinkle of salt and pepper.
2. Spread a thin layer of aioli on each slice of toasted bread. Top two of the slices with tomato, then drizzle with olive oil and sprinkle with flaky sea salt and freshly ground pepper. Add a layer of basil leaves, then close the sandwiches with the remaining slices of toast, aioli side down.
3. Slice the sandwiches in half and enjoy!