I didn’t take any measurements but I suspect this is a very forgiving recipe. I used green amaranth leaves which taste more like spinach than the purple ones. I’m glad my farm is overrun with 7 foot stalks of amaranth! The leaves are tasty, I’ll be trying them in more recipes.
Saute mushrooms and garlic in butter. Add amaranth, stir until wilted. Set aside.
In the same pan, add flour and equal amount of butter to make a roux (approximately 1/2 tablespoon each for a sauce serving 2 persons). Slowly add some warmed milk and whisk until thickened. Add amaranth mixture.
Boil fettucine in salted water. Add pasta to creamy amaranth mixture and heat until very hot, mixing constantly. Stir in some cheese. At this point the sauce may get too thick, thin pasta sauce by adding some of the salted water.
*Cooked amaranth leaves contain about 8% protein, 4% carbohydrates and are rich in calcium, iron and vitamins B and C in higher concentrations that spinach. For example, only 47 g of cooked leaves contains 100% of the minimum daily requirement of Vitamin C.