Brush the focaccia slices with olive oil and toast in a 350 degree oven for 10 minutes. Mix tomato with balsamic, olive oil, basil, and lemon zest and season with salt and pepper. Spread 1 tbsp of feta on each crostini. Add some arugula. Top with tomatoes and a little bit of juice. Add toasted almonds, lemon zest and drizzle with honey.