Heat a large skillet over medium-high heat. Add oil to pan; swirl to coat. Add onion and garlic; sauté 5 minutes. Add turkey to pan; sprinkle with chili powder, sugar, and pepper. Cook 6 minutes or until turkey is done, stirring to crumble. Add cooked freekeh and tomatoes; reduce heat to medium, and cook 10 minutes or until mixture thickens. Stir in salt. Remove from heat; let stand 5 minutes.
Place 1 lettuce leaf on bottom half of each bun, if desired. Spoon about 2/3 cup freekeh mixture over lettuce. Top each sandwich with 1 onion slice and top half of bun.
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