For the beef:
2 cups plain low-fat yogurt
2 tablespoons honey
2 tablespoons peanut oil
1 1/2 teaspoons cumin seed, toasted and ground
1 1/2 teaspoons coriander seed, toasted and ground
1 1/2 teaspoons freshly ground black pepper
2 teaspoons garam masala
1 teaspoon ground turmeric
1/4 teaspoon crushed red pepper flakes
1 1/2 teaspoons kosher salt
4 scallions, trimmed and chopped
2 teaspoons peeled, freshly grated ginger root
1/4 cup chopped cilantro
2 pounds beef tenderloin cut into large bite-size pieces
For the tzatziki:
1 medium cucumber, peeled, seeded and finely diced
1 cup finely diced honeydew melon
Kosher salt
2 cups plain low-fat yogurt strained (to reduce liquid)
1/4 cup finely diced red onion
1 medium jalapeno, seeded and minced
Combine the yogurt, honey, peanut oil, cumin, coriander, black pepper, garam masala, turmeric, crushed red pepper flakes, salt, scallions, ginger and cilantro in a gallon-size zip-top bag. Add the meat and seal the bag, pressing out as much air as possible. Massage to coat evenly. Refrigerate overnight.
Prepare the grill for direct heat. If using a gas grill, preheat to medium-high (450 F). If using a charcoal grill, light the charcoal or wood briquettes; when the briquettes are ready, distribute them under the cooking area for direct heat. You should be able to hold your hand about 6 inches above the coals for 3 or 4 seconds. Have ready a spray water bottle for taming any flames. Lightly coat the grill rack with oil and place it on the grill.
While the grill is heating up, make the tzatziki: Combine the cucumber and honeydew in a fine-mesh strainer seated over a bowl. Sprinkle with a teaspoon of salt and use a spoon to work it in. Let the mixture sit for 5 minutes, then press out as much liquid as possible; discard the liquid.
Transfer the cucumber and honeydew to a medium bowl, then add the yogurt, red onion and jalapeno, stirring to incorporate. Taste, and add salt as needed. Cover and refrigerate for at least 30 minutes. The yield is 3 cups.