The pea mash can also be mixed into salads or stirred into pastas.
Combine peas, mustards, oil, and lemon juice in a bowl. Smash it all together with a fork. Season with kosher salt and pepper. Lightly toast bread. Spread each with ricotta. Divide pea mixture evenly between toasts. Serve with radishes, flaky salt, lemon zest, and more pepper.