Strawberry Barbecue Beef

Name: Strawberry Barbecue Beef
Ingredients: 8 ounces strawberries, hulled and halved (1 1/2 cups), plus 1 pound strawberries, hulled and chopped (3 cups); 2 tablespoons water; 2 tablespoons ketchup; 2 teaspoons light brown sugar; 2 teaspoons plus 2 tablespoons chopped fresh basil, plus more for garnish; 2 teaspoons plus 2 tablespoons white wine vinegar; 2 medium cloves garlic, minced (2 teaspoons); 1/8 teaspoon ground white pepper; 1/8 teaspoon plus 11/4 teaspoon salt; 1/4 teaspoon ground black pepper; 1 1/4 to 1 1/2 pounds beef flank steak; 1 medium cucumber, peeled, seeded, and chopped (11/2 cups); 2 tablespoons finely chopped red onion