Heat oil in a pressure cooker. Fry peas and bell pepper for a minute over medium heat. Lower heat and mix in the broken wheat and turmeric powder. Add chilli powder if required. Cook for 2 mins. on low fire.
Mix in 4 cups of water and salt to taste, and pressure cook the broken wheat till soft and till all the water is absorbed.
Cool at room temperature. Mash the cooked broken wheat and add the gram flour. Blend with your fingers to form a smooth dough.
Divide the dough into 4 portions.
Take 4 pieces of cling wrap. Place a single portion of the dough on one of the cling wrap pieces (6 inches long), wrap the cling wrap around the mixture and tighten the two sides to shape like a sausage. Make four such sausages and place in a steamer.
Steam these vegetable sausages (gattas) for 6-7 mins. Remove from the steamer and cool. Cut into half-inch pieces. Place on a serving plate.
Heat oil for tempering. Add mustard seeds and allow to splutter. Then, add the curry leaves. Pour over the gattas and serve as a starter.