Wash the meat, dab dry and cut into strips. Peel and finely chop the onion. Wash, quarter and seed the tomatoes and cut the flesh into fine cubes. Wash basil, shake dry and pluck leaves from the stalks.
Heat the oil in a pan and fry the meat thoroughly, turning it over. Add the onion and fry briefly. Add lemon zest. Season with salt and pepper. Dust with flour and sauté. Deglaze with stock and condensed milk, bring to the boil.
Add peas, basil (except for a few leaves for garnishing) and tomatoes. Bring to the boil again and season to taste with salt and pepper. In the meantime, prepare pasta in boiling salted water according to the instructions on the packet.
Drain, quench, drain and mix with the sauce. Arrange on plates, sprinkle with seasoned pepper. Garnish with lemon wedge, chervil and remaining basil.