Cut tomatoes into fine strips or cubes. Prepare the couscous according to the instructions on the packet. Add tomatoes, olive oil and lemon juice, season with salt and pepper. Leave to cool.
Cut approx. 1/4 of the peppers lengthwise as a lid, leaving the base of the stalk standing. Clean, wash and drain the peppers. Finely dice the "paprika lid". Wash basil, shake dry and chop finely, except for a little for garnishing.
Finely crumble the feta. Mix paprika cubes, feta and basil into the couscous.
Fill the peppers with couscous, pressing the filling slightly into the peppers. Arrange on small bowls and garnish with basil.