In a mason jar, combine the lemon juice, Dijon mustard, honey, olive oil, fresh basil, salt, and black pepper. Seal with the lid and shake until beautifully emulsified and silky smooth. Alternatively, whisk everything together in a small bowl until fully combined. Set aside until ready to serve.
Wash and thoroughly dry the lettuces, then gently tear the leaves into generous bite-sized pieces, discarding any tough stems.
Slice the peaches into thin wedges, removing the stones as you go.
Thinly slice the cucumber into elegant rounds or half moons.
Roughly chop the pecans for added crunch and texture.
Crumble the feta into soft, salty pieces.
Arrange the lettuces onto a large serving platter or salad bowl, then layer over the peaches, blueberries, cucumber, pecans, and feta.
Drizzle generously with the lemon basil vinaigrette just before serving, allowing the fresh, vibrant flavours to shine at their absolute best.