Preheat grill to medium-high.Advertisement
Combine paprika, 1/2 teaspoon salt, cumin, coriander and turmeric in a small bowl. Heat oil in a small skillet over medium heat. Add garlic, lime juice and the spice mixture; cook, stirring, until sizzling and fragrant, about 1 minute. Remove from the heat.
Slice each tofu block crosswise into 6 slices; pat dry. Use about 3 tablespoons of the spiced oil to brush both sides of the tofu slices; sprinkle with the remaining 1/2 teaspoon salt. (Reserve the remaining spiced oil.)
Oil the grill rack (see Tip). Grill the tofu until it has grill marks and is heated through, 2 to 3 minutes per side.
Combine yogurt with the reserved spiced oil in a small bowl. Serve the grilled tofu with the yogurt sauce, garnished with scallions (or cilantro), if desired.
Kitchen Tip: To oil a grill rack, oil a folded paper towel, hold it with tongs and rub it over the rack. (Do not use cooking spray on a hot grill.)
1 1/2 medium-fat meat, 1 1/2 fat