Cut each tomato in half lengthwise; push seeds out with thumbs. Cut each half into thin strips. Place in a large bowl; add lettuce and basil leaves, and set aside.
Combine chopped basil and next 4 ingredients in a jar; cover tightly, and shake vigorously. Pour over lettuce mixture; toss gently.
Used seeded beefsteak tomato & tiny lemon basil leaves with the salad greens. Chopped sweet basil for the dressing. Very simple but really great.