Cook your crostini rounds as per recipe instructions through the link below if not done already. This can be done up to two days in advance and the crostini kept in an airtight bag or container. Make sure the crostini are completely cooled before storing otherwise the trapped heat moisture will re-soften them.
Zest the lemon and set the zest aside.
Cut the cherry tomatoes in half and place in a small bowl. Add the corn, 1/4 cup fresh basil strips, a pinch of salt and a pinch of black pepper. Drizzle with olive oil. Squeeze a half of a lemon into the tomatoes. Stir to combine and set aside.
In a second small bowl: Make your cheese mixture by combining the ricotta, juice from 1/2 lemon, Parmesan cheese, 1/4 cup fresh basil, salt, and pepper.
Chill the cheese and tomato mixtures separately until ready to serve.
When ready to serve, assemble the crostini by spooning approximately 1-2 Tablespoons of the cheese mixture on each crostini. Then add 1-2 Tablespoons of the tomato mixture. Repeat with all crostini pieces.
Sprinkle the crostini with the lemon zest and additional basil if desired. Serve immediately.