Combine egg mixture in a bowl with a flat base large enough to lie the roll up in. Whisk to combine. Spread sugar out in a small dish. Use a rolling pin to roll the bread flat. Spread each piece of bread with around ¾ tbsp of Nutella. Sprinkle strawberries along the bottom of each piece of bread. Roll up bread. The Nutella will keep it sealed.

Melt butter in pan over medium high heat. Roll each roll up in the egg mixture, shake off excess then place in the pan. Repeat with remaining roll ups. Cook for around 4 minutes until each side is golden, rotating every 1 minute or so. Remove from pan and immediately place in the sugar. Roll to coat in sugar, then remove. Repeat with remaining roll ups. Serve immediately, while warm.