Steaming is widely considered one of the best cooking methods for preserving nutrients, especially water-soluble vitamins like vitamin C and B vitamins, since the vegetables aren't submerged in water where nutrients can leach out. Roasting and stir-frying at moderate temperatures are also good options, while boiling for extended periods tends to cause the greatest nutrient loss. Cutting vegetables into larger pieces before cooking and minimizing cook time also helps retain more of their nutritional value.

Gently press the avocado with your thumb near the stem — if it yields slightly to firm pressure, it's ripe and ready to eat. You can also check the small stem cap at the top; if it comes off easily and reveals green underneath, the avocado is ripe, but if it reveals brown, it may be overripe. A hard avocado that doesn't give at all is still unripe and needs a few more days at room temperature.

No, it's generally not safe. Perishable foods left at room temperature for more than 2 hours enter what's known as the "danger zone" (between 4°C and 60°C / 40°F and 140°F), where bacteria multiply rapidly. If the room is particularly warm, above 32°C (90°F), this window shrinks to just 1 hour. To stay safe, refrigerate leftovers promptly and when in doubt, throw it out.

Yes, in many recipes you can substitute butter with oil, though the ratio and result may vary. As a general rule, use about 3/4 the amount of oil as the butter called for, since oil is 100% fat while butter contains some water. Keep in mind that oil-based baked goods tend to be denser and more moist, while butter contributes more to flavor and a flakier texture, so the swap works best in cakes and muffins rather than delicate pastries like croissants.

A "best before" date indicates when a product is expected to be at its peak quality — flavor, texture, and freshness — but it's often still safe to consume after this date if stored properly. An "expiry" or "use by" date, on the other hand, is a safety indicator, especially common on perishable items like dairy, meat, and ready-to-eat meals, and food should not be consumed past this date due to potential health risks.

Most cooked leftovers stay safe to eat for 3 to 4 days when stored in an airtight container in the refrigerator at or below 4°C (40°F). After that, the risk of bacterial growth increases significantly, even if the food still looks and smells fine. If you don't think you'll finish leftovers within that window, it's best to freeze them instead, where they can typically last for 2 to 3 months without a major drop in quality. Always reheat leftovers to an internal temperature of at least 74°C (165°F) before eating.