Brush a box mould (20 cm long; approx. 1 l capacity) with oil. Caramelise 50 g sugar until golden yellow. Deglaze with 75 ml water and boil down for about 5 minutes while stirring. Pour into the box mould and allow to set.
Peel 3/4 of the mango, cut the flesh off the stone (drain the canned mango, put a piece aside for decoration). Puree the fruit flesh and 2 tablespoons lemon juice. Stir in cream and 75 g sugar with a whisk.
Whisk eggs, stir in. Spread on the caramel.
Place the box mould in a high casserole dish. Pour so much hot water into the casserole dish that about 2/3 of the casserole dish is in water. Leave in a hot oven (electric cooker: 150 °C/circulating air: 125 °C/gas: level 1) for approx. 1 1/4 hours.
Let it cool down. Then cover and leave to cool for at least 6 hours, preferably overnight.
Wash, clean and halve 250 g strawberries. Puree with 1-2 tbsp sugar and 2 tbsp lemon juice. Use 2 tablespoons to cut the flan into cams and serve with the sauce. Decorate with the rest of the mango in wedges and strawberries, dust with icing sugar.