Add sugar, put on low heat, count 45 minutes of cooking watching !
When the consistency becomes a bit syrupy and amber-colored (beginning of caramel color) remove from heat, add saffron and the leaves of tarragon sliced.
Let cool and place in refrigerator. Rinse the whole strawberries under a stream of cold water.
Remove the stalk, cut each fruit into 4 slices in a bowl.
Add the milk mixture, and mix it thoroughly.
You can prepare the milk mixture in advance, but the strawberries will be cut just before serving.