Goat's cheese feta roulade

Roulade

• 60 g salted butter
• 50 g Gruyère cheese
• 3 eggs, separated
• 120 g water
• 40 g cornflour
• 1 tsp baking powder
• 30 g tomato paste
• 1 tsp sweet paprika
• 1 pinch salt
• 1 pinch fresh ground black pepper

Cheese filling

• 5 sprigs fresh flat-leaf parsley, leaves only
• 5 sprigs fresh mint, leaves only
• 5 sprigs fresh coriander, leaves only
• 150 g goat's milk feta, cut into pieces
• 100 g cream cheese
• 10 sprigs fresh chives