Mini cottage rolls - Weet-Bix

Ingredients

• 1 x 425g tin brown lentils, drained
• 100g button mushrooms, finely chopped
• 1/2 medium brown onion, grated
• 1 medium carrot, grated
• 2 Tbsp tomato paste
• 1 1/2 Tbsp soy sauce or tamari
• 3 Weet-Bix wheat biscuits, finely crushed
• 2 square sheets frozen puff pastry, just thawed
• 2 tsp sesame seeds, optional