Orzo risotto with shrimp and ouzo

300 g orzo ½ kg raw shrimp 1 small onion 2 cloves garlic 1 small red pepper 1 small zucchini 400 ml concassé tomatoes 30 ml ouzo (2 tbsp) 600 ml stock made from shrimp shells 60 ml olive oil (4 tbsp) 1 tbsp tomato paste 1 tsp sweet paprika zest from 1 lemon 80 g crumbled feta salt pepper