Best Egg Rolls

INGREDIENTS:
10 Spring roll sheets
1 lb/450g cabbage
2 medium carrots
4 scallions/green onions
1/2 tbsp ginger (grated)
1/2 tbsp garlic (grated)
1/2 tsp salt
1 tsp sugar
1 tbsp soy sauce
1/2 tsp black pepper powder
1/2 tsp Chinese 5 spice powder
4 cups oil (or as needed)
1 tbsp ap flour
2 tbsp water