Garden Salad with Orange-Dijon Vinaigrette

1/4 cup orange marmalade

2 tablespoons Dijon mustard

1 teaspoon Worcestershire sauce

3 tablespoons red wine vinegar

1/3 to 1/2 cup extra-virgin olive oil

Salt and freshly ground black pepper

2 large or 3 small romaine hearts, chopped

3 to 4 celery ribs, chopped

1/2 seedless cucumber, sliced

1 small red onion, chopped or thinly sliced

2 ripe tomatoes, chopped

1/4 cup fresh herb or herbs: parsley, basil, dill, tarragon - whatever is on hand, optional