Get these eggs-actly right to find the next clue

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Across
  1. 4. People from this country decorate eggs as part of an Easter-time tradition called 'pysanka'
  2. 5. These bread knots used to be associated with Easter as they supposedly look like arms crossed in prayer
  3. 7. Biscuits and buns baked on Good Friday are said to never undergo this normal process of decay (named after scientist Steve)
  4. 10. The Easter bunny tradition comes from this country
  5. 13. Medieval festival celebrated in the week after Easter
  6. 14. This English city is where the first chocolate egg was produced
  7. 15. People give things up during this pre-Easter period
Down
  1. 1. The world's largest egg can be found in this country eh?
  2. 2. The maker of the world's most egg-spensive egg
  3. 3. A type of joke designed to eggs-acerbate arguments about egg humour
  4. 6. Which society came up with the method of calculating Easter that we use today
  5. 8. This is ill-egg-al in Germany on Good Friday
  6. 9. Because the date changes every year, Easter is an eggs-ample of a 'moveable ...'
  7. 11. This celestial body determines when Easter is celebrated
  8. 12. Cadbury makes more than 1.5 million of these a day