Ingredients
- For Maria Rosa’s sauce:
- 2 Tbs. butter
- 4 Tbs. (2 fl. oz./60 ml) olive oil
- 2 carrots, diced
- 2 small celery stalks, diced
- 1/2 large onion, diced
- 2 garlic cloves, chopped
- 2 Tbs. chopped fresh flat-leaf parsley
- 2 1/4 lb. (1 kg) canned whole plum tomatoes
- Salt and freshly ground pepper
- For the béchamel sauce:
- 1/3 cup (3 oz./85 g) butter
- 1 3/4 oz. (50 g) all-purpose flour
- 1 1/4 pints (22 fl. oz./700 ml) milk, warmed
- Salt and freshly ground pepper
- 1/4 tsp. ground nutmeg
- For the lasagna:
- 7 standard lasagna sheets, cooked al dente, chilled in cold water and drained on kitchen towels
- 3 oz. (85 g) finely grated Parmesan cheese
- 5 green lasagna sheets, cooked al dente, chilled in cold water and drained on kitchen towels
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