Soak the dried ingredients: Place dried apricots, ancho chilies, chile de árbol (if using), and hibiscus flowers in a bowl. Cover with 1 cup of hot water and soak for 20 minutes until softened.
Blend the mixture: Transfer soaked ingredients (with soaking water) to a blender. Add lime juice, sugar, and salt. Blend until smooth, about 1-2 minutes. Add water 1 tbsp at a time if too thick.
Strain for smoothness: Strain the mixture through a fine mesh sieve for a silky texture, pressing with a spoon to extract liquid. Skip for a chunkier sauce.
Adjust seasoning: Taste and adjust with more lime juice, sugar, or salt as needed.
Store and chill: Transfer to a clean jar. Refrigerate for at least 1 hour before serving.