Green Salad with Asparagus & Peas (Salat med Asparges og Ærter)

1/4 cup lemon juice

1/4 cup canola oil, or extra-virgin olive oil

1 teaspoon sugar

1/2 teaspoon salt

1/4 teaspoon freshly ground pepper

2 heads Boston or Bibb lettuce, torn into bite-size pieces

2 cups very thinly sliced fresh asparagus, (about 1 bunch)

2 cups shelled fresh peas, (about 3 pounds unshelled)

1 pint grape or cherry tomatoes, halved

2 tablespoons minced fresh chives, or scallion greens