Place the baguette slices on a baking sheet and brush with 2 tablespoons of the oil.
3
Toast until golden, about 10-12 minutes.
4
Food processor: puree peas, ricotta, scallion, Parmesan with the remaining 2 tablespoons of oil, lemon juice, salt, pepper, until the Parmesan is broken down and the mixture is nearly smooth.
5
Spread the pea mixture on the crostini and top with grated Parmesan, if desired.