½ tsp. English mustard
1 tsp. yeast extract
40g plain flour
50g dairy-free spread
½ onion, peeled
500ml unsweetened soya milk
12 lasagne sheets (you may need 1-2 more, depending on the size of your dish)
1 tbsp. balsamic vinegar
1 tsp. sugar
2 tbsp. tomato puree
2 x 400g tins chopped tomatoes
1 tsp. thyme leaves
½ red chilli, deseeded and finely chopped
3 garlic cloves, finely chopped
1 red pepper, diced
1 red onion, finely chopped
2 aubergines, chopped into small chunks
3 tbsp. olive oil