Peel and slice the plantains and toss them in the lemon juice. Add to the casserole and fry for a further 5 minutes, stirring regularly so they don't catch.
3 green plantains, 2 teaspoon chilli flakes, juice of ½ lemon, 2 teaspoon salt
Add the tomatoes, stock cubes, salt and enough water to just cover everything. Put the lid on and simmer on a low heat for 2 hours.
1 can chopped tomatoes, 750 ml beef broth
About 20 minutes before serving, make the Ugali. Bring the water to a boil, then slowly add the cornmeal a spoonful at a time, stirring constantly. Keep going until it thickens to a consistency slightly thicker than mashed potatoes.