Lemon-Lime Tarts

Name: Lemon-Lime Tarts
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: European, Mediterranean, French
Ingredients: 3 egg yolks; 4 packets or 2 tsp. powdered stevia; A pinch of salt; 1 tsp. lemon zest; 1 tsp. lime zest; 1 cup hazelnut or almond flour; ½ cup buckwheat flour; ¼ cup flaxseed meal; ½ cup organic butter, at room temperature; 1 ½ cups thick Greek-style yogurt; 3 packets or 1 ½ tsp. powdered stevia; ¾ tsp. alcohol free vanilla; 1 ½ tsp. lemon zest; 1 ½ tsp. lime zest; Lemon and lime slices for garnish