Chocolate sponge cake with mint & strawberry

Ingredients

• 400 grams (14.1 ounces) butter
• 200 grams (7.1 ounces) sugar
• 8 large eggs
• 300 grams (10.6 ounces) flour
• 100 grams (3.5 ounces) cocoa powder
• 100 grams (3.5 ounces) bitter chocolate
• 10 grams (0.35 ounces or 2 teaspoons) baking powder
• 1 pinch of salt
• 500 grams (17.6 ounces) strawberries
• 100 grams (3.5 ounces) powdered sugar
• 100 grams (3.5 ounces) fresh mint
• 400 milliliters (1.7 cups) heavy cream (33-35%)
• 800 grams (28.2 ounces) cream cheese