General tips
When you are travelling, you should have a quick think about where your food has come from. When/if it is locally produced, your food is likely to be tastier, better for the local economy and fresher.
Oven Tips : Check the seal on your oven door for wear. Even a small tear or gap can allow heat to wander away from your meal. A clean seal also provides better heat retention.
Buy Local Food : Take a child shopping with you, pick up one of the offending products and say quite loudly "Well we’re not buying that, think of the energy it’s used up just getting here!"