Chefbee Stainless Steel Steamer Pot - 3.2QT Steamer for Cooking with Food Basket, Steaming Cooking Pot Kitchen Cookware for Vegetable, Food, Dumplings, Soup

Steamers are very common in the UK/Ireland. We use pots that look like this. Things are a lot less likely to fall through the holes than you think, even small stuff like (damp) couscous. Puddings are either cooked in a covered dish placed in the steamer or in parchement paper/cheesecloth, depending on the recipe (search for 'pudding basin' on amazon, there are loads).