Cook the peas in salted water for approx. 4 mins. until just soft, drain, rinse in cold water, drain again.
Mash half of the peas with a fork, add the remaining peas. Mix in the basil and all the other ingredients up to and including the pepper.
Bake the baguette slices for approx. 4 mins. in the upper half of an oven preheated to 240°C. Remove and allow to cool a little. Spread the pea mixture on top.