Use Turkey (mince) in place of beef wherever you can, tastes really good and it's only about 2% fat compared to a minimum of 7-8% for very lean beef.
EWW turkey mince is awful quorn mince much nicer IMO and also very low in fat.
Don't need to do exercise to lose weight. it helps and improves your overall health though.
Weightloss is as simple as energy in needs to be less than energy out.
How you achieve hat does not mater. Some diets like Atkins help as it suppresses hunger pains/addictions and it is hard to replace the lost calories in carbs with fat/protein.
Stews, salads, soups, stirfrys, curries.
Curries: prawn and butternut squash with low fat coconut milk.
it all depends what you mean by low cal.
even burgers are good, if you make them yourself.